You can be refunded the entire VAT Credit quickly by forming a “marketing company” which exports a whole product that Bayramoğlu manufactures that, of which you can make an export-purpose sale.

If you meant for it to be plural:
"You can be refunded the entire VAT Credit quickly by forming a “marketing company” which exports whole products that Bayramoğlu manufactures, of which you can make export-purpose sales."

Commas are to indicate where someone takes a breath during the sentence, and it is used to join two ideas/clauses. Like in the way I just did. What you wrote may be possible to say in one breath, though it could make this into a run-on sentence.

The "of" that I added before the last "which" after manufactures, is to indicate the relation of the previous clause to the last clause by saying. To define it: The "of" connects the two clauses by displaying that anything after the "of which" is done because of the info before

We highly recommend that a company should be formed, whose name is MAVI LLC, that is owned by BB and the products should be exported through this company next time.