Having problems with buyer

I having problems with the buyer. I sold my ps4 Wednesday and it was delivered to the buyer on friday and it was confirmed by FedEx. But the buyer won’t confirm the transaction, and I tired messaging him but he won’t respond back. But today he put the item on hold for review, and I message him today and he still did not respond to my new message either. I feel like I’m getting scammed for my ps4. So what can I do to speed up this process, and if I do get scammed, how do I get my money back

Write to support, but remember. They dont work at weekend, you have to wait.

Nah, they said to me that they started to work at weekends too, they said it themselves on my last support ticket~