Returned item that was not as described

[ferreter]

I purchased a pair of sneakers that were supposed to be size 13 but were more like a size 10. Seller sent email with return label but deducted the return shipping cost from my purchase. The initial shipping cost was also not returned to me. This was not a matter of me changing my mind on the purchase, it was a mistake on the seller's part. Now I am out $20 and have nothing to show for it. Why should I have to pay for the seller's mistake!

[wooden_flower]

It sounds like you selected ‘does not fi’t as the reason for return, not ‘not as described’.  Does not fit is considered buyer’s remorse - the assumption being that you purchased the wrong size.  This is an error you can not correct.