Goods well - redemption terms and Porte doubtful

The shade was good - but it did not fit and had to be returned, they sent me a return label with Adessaufkleber to - drew attention when it is not being used - it will cost Porto.
He was used - Nope - still return costs 6.99 euros. Confidence trick.
And when you do point out a mail comes with the message, in the Conditions of Use is that the customer always has to pay the return postage .... !!! Why this was probably not the same as indicated on the return form - very questionable !!!!