Getting scammed via Venmo

I sold a brand-new electric hedge trimmer through Facebook Marketplace. The buyer picked it up in person and paid me through Venmo Friends & Family.

The next day, I received notice that the transfer had already been reversed after the sender disputed it through his bank as unrecognized. The bank reversed the money before giving me any opportunity to reply, explain the transaction or submit evidence. Venmo told me it could not undo the bank dispute or provide the bank information I asked for.

I messaged the buyer, sent screenshots of the reversal and asked him to resend the payment. He then blocked the Facebook account I had used for the Marketplace transaction. I confirmed from another account that his profile still existed. I also reported the account to Facebook; I received no response, and when I last checked the account was still there and had not been flagged or removed.