False Fake Claim- How do I handle?

I sold a low-end luxury item that I’ve had a long time and never used at a very low super reasonable price because I didn’t keep receipts from years ago of course. The buyer has had the item well over a week and is now all of a sudden accusing me of selling a fake with nonsensical “proof”. Im thinking they just need money back. This is my first complaint/sale gone wrong. It’s really offensive!

reddit.com
u/FrozenMolly — 8 days ago

When You’re Trying to Be Tough in a Woman’s Fitted Coat

This parka is very obviously darted at the waist, elder woman’s section of Ross? Probably stolen from Dia’s mom

u/FrozenMolly — 9 days ago