I wish you were right. But you are not. There are countless of examples that I personally know, where it states in the contract when you have to be paid, and they were not. So often it is tiring. And it is a consequence of trade since it makes humans prioritize their own selves, so those "bosses" do not care much about their "slaves".

Also, in the contract it is mentioned you need to work only 8h a day, but many times you work more than that.

All of these agreements, written or verbal, will never be respected simply because the trade relationship between the "boss" and the "worker" is imbalanced towards the "boss" who has a lot more power.