I've bought a push chair off ebay, and it has two clips which don't work (ones which hold the seat-back up) . I emailed the seller to tell her and she says it was fully checked and all clips were working but I can return if I like. I have told her it's not actually useable as is, and it's not a matter of "if I like". I am miffed that I will be out of pocket by the return costs for something that is totally not my fault and shouldn't have been sold in the first place. This is not something that would have got damaged in the post. Is there anything I can do?