Can anyone please help me, I’m in a tricky situation and eBay are of no help at all.

I sold my saddle on here all well and good, in perfect condition bar one deep scratch on the seat. The buyer messages me a week or two after receiving it claiming the saddle is broken and can not be used. After much back and forth I was forced to accept the return. This was beginning of October. My saddle just arrived to me last night is appalling condition, broken and covered in man made scratches. I messaged the buyer stating this and how I would only offer her 50% refund back as I feel this is fair. However she has escalated it majorly and is refusing, my hands are tied! eBay is refusing to help and siding with the buyer whom is lying about breaking my $1000 saddle. What can I now do legally? I’ve removed all my bank and card details so they cannot automatically refund the buyer which is unfair. Where are my rights as a seller!?