Work suck

Got promoted. They promise me $20/hr. Come to find out they're paying me $18/hr. They didn't write down anything we'd talked about. I never got the $20 thing in writing. I can't quit because I don't know where else to go for this same pay rate. I'm kinda livid. So now I'm here working 14 hour days for $2 an hour less than promised. Yay!