Over $500 being held up due to unresolved sales/disputes — any way to escalate?

Last month, I had 3 sales that were completed. Two of them were successfully transferred, while I ended up canceling the third and paying the associated fees.

The problem is that one of the two successful sales is now being treated as if it was never transferred, even though I submitted proof that it was. I opened a dispute about this two weeks ago.

The other issue is that my second successful sale is being withheld because of the incomplete/canceled sale. I was already charged the sale amount plus the associated fees for that transaction, so I also opened a dispute about this as well.

Customer support hasn't been much help, and I haven't received any updates on either dispute.

At this point, I'm out over $500, and I have a credit card payment coming up soon. Is there any way to expedite these disputes or someone I can contact to escalate this besides the general customer service number?