I work in tech and quit the perfect job
medium.com
medium.com
Ideally you would just schedule a meeting on your own and say "I want to discuss something that was in the contract I signed. Look here..." Seems easier than it is, but when you have a clear business case like that, direct communication is really effective.
It works because it says to your boss, "I think of you as someone who keeps his promises, so I'm reminding you of this one." The note on the review starts off on the wrong foot. By accusing them of not honoring terms in contracts, you trigger a defensive reaction -- part "I'm not a bad person", part "Am I going to get sued?" No need to be adversarial when you could be partners.
I mean, I get it, I thought my boss said he could do the raise I asked for and went three months before saying "Hey, it didn't show up in my paycheck." Extremely uncomfortable, and I'm procrastinating asking for a promotion because I don't want to talk about money again. It's just a warning sign, you don't come off as an all around bad person.