After advice please... I recently sold a child's hoodie on eBay, was selling lots of things at the same time and I must have got muddled and stupidly advertised it as M&S when it should have been Next. The item only sold for 99p.
The buyer contacted me when it arrived to let me know the mistake, I offered either a return or refund with them keeping the item anyway. They said it was fine they'd keep it. They've now left feedback which is rated positive but in the text is a long moan about item not as advertised etc... I feel this is really unfair, can I do anything about it?