Hi, I'm Nathan.Sorry to hear that you're having trouble with this but I'll do my best to help you.
Receivers do fail on these, but it could be the motor as well. If you (or electrician) can by pass the receiver unit and wire the motor directly to line, that will isolate which is at fault and tell you if the entire fan needs to be replaced or just the receiver unit. Let me know the results, and I'll help with a replacement component if needed.
Yes I'm here, your reply just came through, thanks.
You can buy an aftermarket receiver/remote (kit, you have to replace both) for around $25, which you could do yourself or have your electrician do (so factor in his time and cost): http://amzn.to/2d9uCL5
They are actually cheap enough that you may be better off just buying one and have your guy install it and be done, it would probably be cheaper than having him come once to test and again to install later, as chances of a bad motor are pretty slim/
Also if you prefer the more robust remote with the thermostat options, you can get that too, it just costs a bit more: http://amzn.to/2d4Szr7
Just checking in, were you able to order the replacement part I had sent info on, or do you need more help with this?