"contractors don't get raises" Correct they negotiate contracts instead, when your contract is up demand an increase. "I have to help and work unpaid overtime

"contractors don't get raises" Correct they negotiate contracts instead, when your contract is up demand an increase. "I have to help and work unpaid overtime", incorrect you are a contractor the only thing you have to do is what is in your contract. If it doesn't specify "unpaid overtime" then clearly state that isn't in your contract so you aren't going to do it.