Very sorry to hear it. I've employed many on oDesk then Upwork over the years and almost always have great experiences with freelancers. In a rare case when I did have an issue, customer support wasn't very good from the hiring side either, fyi.

Also I think they shot themselves in the foot with the big price hike. Previously freelancers and I would just keep using their platform throughout working relationships. Now we use it like a dating app, meet a freelancer, work a project or two to build trust, and then leave the platform to handle payments on our own.