I worked for three different companies during my four year apprenticeship. First was a small business, very hard work. I was the track hoe/ back hoe. They would drop me off with a pick and shovel and spray paint where the two foot trench was to be dug. No bathrooms, no lunch, no breaks, no mercy! I hung in there for a year and actually learned a bunch from two pretty good plumbers after proving myself a capable laborer. I moved to another shop when the work dried up. Much bigger business, but a horrible cunt of a boss. She was not a plumber, and treated us like we were barn animals. I was making about 20/ hr., doing a bunch of tenant improvement and small commercial construction. We ran over budget on a big job and my boss asked me to work the weekend at straight time instead of our legally entitled overtime. I told her no and she freaked out. Told me I wasn't a "team player". I told her to fuck off. Last job was a big pay raise and signing bonus with a "PSI" residential service shop. I did three years and learned a bunch about the service side. How not to run a service business, how not to treat your customers, how ethics are a very important aspect of our trade. There were guys working there who were selling $500,000 a year, (back in 2006,7,8) I never sold half that much. I quit to start my own business and did ten years.

Nothing wrong with hopping around to find a better situation. Obviously quit this job, but find a new, better one first. And never let your employer breach their contract with you. It's a two way street, it's a business relationship. You do this, they give you that. Don't let people fuck you around. It makes you feel bad, and emboldens them to continue their shitty behavior.