leave and get a new job the red flags in this is people who are suppose to help you are late and westing your time and also the passing of the teachers of who you learn from will get to anyone. That happened to me when i was learning kenpo a type of karate, I would only go once a week but still being told by the person who run the dojo saying you are doing great but one of the other students your are learning from saying you need help was not, I only lasted a year. Also staying late and not getting paid over time nope I would walk out you don't need the stress because you still after three or fours months working still can't get in the building would tick me off big time.