Buyer sent funds to a PayPal account that did not exist after agreeing to Apple Pay. Tried to disparage me as a scammer on my for sale thread. I had to create a PayPal account in order to refund him, creating a tax liability for me since he sent it as goods and services. I have never left negative feedback for anyone, but instead of owning his mistake, he doubled down and blamed me. Mods had to step in and point out his fault.
