“No returns or exchanges on goods sold”

If a product is sold subject to the condition
that it cannot be returned or exchanged, that is not permissible, because it is an invalid condition which may lead to harm or confusion, and
because the intention of the vendor in stipulating this condition is to oblige the purchaser to keep the product even if it is faulty. This
condition does not exonerate him if faults are found in the product because if it is faulty then he should exchange the faulty product or the
purchaser should be given a reduction, because the full price is given in exchange for a sound product, and if the vendor takes the full price
when the product is faulty, he has taken it unlawfully. 

According to sharee’ah, customary conditions
are as valid as verbal conditions. Customarily it is assumed that the product will be free of faults, so the purchaser is justified in returning
it if it is faulty. 

And Allaah is the Source of strength.