That's because they don't accept returns. They tell you to keep the product and they send you a code to buy something else from tgem. HOWEVER the code is only for half the price you paid for your item/s.
I spent £116 on 2 pairs of yoga pants they sent me a voucher for £55 so to 'exchange' to another 2 pairs of pants I have to add £60!! Not quite an exchange in my book. Complete crooks!