First, you need to check the fault code by connecting your vesc to your computer (via usb), going to the “live data” tab, and clicking “activate sampling”. There’s a bunch of data that will now change under the graph, and one of those says “fault code:”. Tell us what that fault code is and it may be just your settings that need to be changed. A classic example is you could just be powering your vesc with a voltage outside of the range you set in the first page of settings (the min and max voltages).
If it’s physically broken (which we can determine biased on the fault code), then it’s nothing more than an expensive paper weight. You won’t get any service unless you pay for the premium.
EDIT: you beat me to it @Jinra haha.
Yea, your pretty much screwed, buy a new one from chaka, and this will likely never happen again, and if it does, chaka repairs vesc bought from him for free or at a little charge. As a forum, we have gone through huge fights over and over about the vesc, and chaka has shown he has made changes to the vesc that seem to make it more stable/less likely to break.