What should I do in situation when supplier send products that do not conform with the required of the tender and procurement contract?

In this type of situation product should be return back to supplier with a warning note .

Send it back because it does not conform with the required term and specification plus you have LPO's to be sent before buying or orderiNG.

First of all, there should be safeguards in the system to ensure that such a situation should not occur at all. It is not only a question of protecting your money spent on procurement, it also involves consequences associated with non-fulfillment  of your requirements and resultant delays in completion of the projects. 

So we must have very clearly defined specifications and other requirements while awarding the contract and there should be in place checks to ensure that the manufacturer and supplier both adhere to those requirements. This can be done through verifying the production and supply process at various stages in the supply chain. If the supplier still delivers material which does not conform to our specifications, we must have stringent control over payment stream not to release the amounts and exercise punitive actions as per contract.

Easy. Client or PMC wont accept the material which does not have valid approval. So, Its would be better to send it back and asking for approved materials. Or else, We should start from the point zero to get the material approval, which can be resulted in vain. Even Client can cancel your contract If such things repeat.