Dispute scam — account is frozen, can’t seem to contact Venmo

Buyer took delivery of a coffee grinder I was selling, then filed a dispute and ghosted after Venmo paid him back and froze my account. Buyer won’t respond to emails, deleted Reddit account, and won’t return the grinder.

(Grinder was practically new and worked fine).

Have never been able to raise support — “chat agents unavailable”.

And advice?