Sorry to hear about this Shadi. Kevin is one hell of a asshole. I try to refrain from using profanity but this man utterly deserved it. Will do my best to let every other freelancer know of this and recommend them to stay away as they can from Upwork.
I also tried to refrain, but, as Medium seems to be the only effective medium for myself to vent my frustration, I had to let a couple pop.
Yes, it really is one of those things which you say to yourself 'Oh, it'll never happen to me', then actually it does. I'm the 3rd person I personally know of that's had this happen to them. So I think it's more prolific than it seems.