I once had a disagreement with Freelancer over a few hundred dollars. I was a buyer, rather than a seller, the job didn't get done, and I was trying to withdraw the funds I put in. So, although in the US, I filed a small claims case in New South Wales. This can be done entirely on line. It's possible to request court hearings by telephone. So you can do a small claims case remotely.

Within 8 hours after filing the case and sending the documents to Freelancer, I had been paid by wire transfer. I then withdrew the case.