I worked at a job for 3 weeks and didn't get paid for a couple of the days

I had to sign a paper saying that if I stay less than 2 weeks they will take $150 out of my check. Ok fine, but I was there 3 weeks.. I called the owner today to ask about it. He said he considered the days I actually worked to be less than 2 weeks. He said I worked 10 days, I actually worked 12. I'm pretty sure I'm missing at least 2 days of being paid. 16 hours times 13.00 an hour. Whatever that comes to. And he tried to tell me I'm the one who owes HIM money. I guess I'll just let it go because he thinks he's right. But still makes me mad. I think it's illegal for him to do that.