Poshmark Stealing Items? Anyone have this issue?

Hello! I have been using Poshmark for over a year and I am seriously frazzled over the craziest situation. I sold a Gucci Watch. I sent it to the Buyer. I saw USPS confirmed the delivery, then my entire listing was deleted and my account was all listed as Not For Sale. The watch is genuine, but the buyer had no listings, not much of a history and only 33 followers (which anyone can get 50F a day)

I had a pending balance for the watch and then Poshmark zeroed it out. They relisted my watch on my page at a higher price. I contacted them 11 times now with no response. I cannot sell a watch I do not have. The buyer has it. I have not been paid.

I only list genuine items. I have sold dozens of authentic labels. I have a 5 star rating and Poshmark took my money. Has this happened to anyone? Any chance that the buyer didn't exist and Poshmark is creating false people, then not paying and reselling on their own? Otherwise, why didn't I get paid? Why didn't the buyer contact me? Why is my account repeatedly being changed by Poshmark? Why aren't they responding at all?