Let's say you had a salary raise for the past few months, but you haven't signed anything new (ie. you are still on the old contract with the old salary written in there).
Then, you hand in your notice and quit. After you quit, you receive just the salary written on the old contract without a bonus/raise.
Is it common for people not to get new contracts when getting a promotion or a paycheck raise? Can I do anything about this issue in order to get the raise part of the new salary paid by them?