I work almost plus 50hrs per month and the employer does not pay me for the extra hours. I want to know: 1- do they have to pay me for the extra hours? 2- can I claim that when/if I want to resign?

You may be entitled to overtime pay. However, there are some jobs that are not entitled to overtime in Ontario. We would have to review the nature of your employment, along with your contract, to be able to provide you with advice. Please contact our office for a consultation