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Let us say that their service is so bad that you are really mad. Having to experienced irate customers, would you do the same now that you are a customer?
Find out what is the problem with the company, why their transaction is bad. Try if possible to forward the file or transaction to other colleagues. Report to your boss and tell him/her see what is happening.
Customer service is a best-practice function not a retaliation field
i will direct him to the do what i want using my client's handling method,