I sold a bluetooth device that is not compatible with my new phone, it still works and worked before I shipped it out, but my buyer is saying it won't pair with their phone and calling it defective. I know for a fact it paired with my old phone before I sold both of them, but of course there's no way to prove that. The seller gave me their phone model and from what I researched, it won't pair because of a compatibility issue, though the seller says they have "many others" of the same model that they bought from me. My original listing said no returns, so I'm wondering if I'm screwed or if I have a chance at fighting it? I've never ran into this issue in my many years of selling, I don't know why someone would knowingly sell something that was broken knowing they would run into this issue, and I definitely would not.
