If you are on temporary contract and after your joining by a week, you are informed that the pay terms is changed what you will do?

In the respected and reputed company there are certain rule and regulations in term of short or long term employees. Company should take the responsibilities for that matter and company should place you in the other alternative agencies or should do some negotiation. If any company plays this role as irresponsible then there will not be any trustable environment and no one can trust.

In my view in that condition once talk to the senior management level and try to get it again. If not possible then request the company to replace you in other reputed company or place. If it is also not possible and company is not ready to bear their contract then inform to the local government for help

This may be happened in low level companies but well reputed organizations own their commitment. Probation period is to check the competency level of an employee, if not found upto the mark/requirements then probation period never extended. I think this a professional way at the both side.

In my opinion, any kind of employment whether it is short term or long term, temporary or permanent, the company follows some code of employment and ethics. In this case, the employee joined the company after accepting the offered salary and other terms and conditions. Under no circumstances, the company cannot decrease the salary20% in comparison with the agreed salary with the employee. In this case, the company has broken/violated the agreement and trust with the employee. There is reason to stay further in that company and therefore, leaving the company is the only solution by submitting your resignation.

Ideally, any change in a contract should be one that is mutually agreed upon by the employer and the employee. However, if the remuneration or payment terms are changed without your consent you can approach your manager/ HR for an amicable discussion to understand the reasons for the change. Perhaps there is a clause that you have misunderstood or maybe there is a valid reason for the change. In any case, it is an opportunity for you to clear the air amicably. If you are not able to come to a reasonable agreement or solution, you can choose to have a graceful exit from the company and be more cautious when choosing your next employer.

You are advised to talk to the Human Resource Manager in this regard.  Actually never happend in good organizataions.  Its totaly unlawful.

Thanks for all the inputs, I want to clarify that this case study aim is to explore the effect of violating the employment contract either the legal or psycological contract. 

I believe most of you agree that violating the contract leads to several consequences on the company level:

- turning over

- loss of employee's trust

-loss of good will 

-endanger the organisation to get fine and in some countries might cancel the trade licences

on the Employee level as some of you pointed out:

- loss of his job

- disatisfaction

- in some case fraud (yes, it can happened in some cases, the employee get motivated to steel to overcome the loss of pay and even will justify it "the employer started it not me").

Finally, I want to point  that this behaviour, in my point of view, is not company behaviour, it is manager's behaviour; a manager who try to convince the management that he/her is saving while actually is comitting the biggest damage against the organisation.

For me I will not continue with this contract because the company is not committed with me from the begining so why I have to stay with them and its a temproary contract. The agreement should fe from the first day till the end day without any changes execpt some cases 

Dear Samar I agree with Farrukh slim answer

Dear Samar,

You have to analyse your decision with advantages and disadvantages

Make balance between them

The most important see if you your income is enough to support the life and you have a good future in the organization (upgrading knowlege experience, training ... etc) In the final dont leave your job untill you find another one and dont leave the company with anger but print a good effect and behavior. 

I would agree with Mahmoud, be it that a desire to leave is not always easily followed by the decision. Do you have a family to take care of, is your Iqama or residence permit transferrable, should you leave on your own, would your employer still pay the move back, and if not, are you able to pay for it, etc. etc. I agree such behavior is a sign of an unethical, or at least highly unfair behavior. A professional company, should there be a good reason, would have discussed this with you, explain the reasons, and perhaps offer a solution. In this is not the case and you can afford to, leave, else its time to polish your CV and find a new job before you leave. This serves to ensure you, just like the company, can honour moral and financial obligations you have to people other than yourself, depending on your income.

in this case my respond should rely on using my social and huminitarian skills in an attempt to get excluded from this decision, otherwise, i would not leave the job unless another better opened opportunity is available for me.