What country are you in? What visa did you come in on? Did you give the school your passport?
If you are in China then it certainly shouldn't take 2 months to get a visa. When does your entry visa expire?
If you say you will leave they may give you problems and try to keep you, not pay you or make you leave the country even!
I hate to give this advice, but if you at an illegal school: Get a job offer from another (ligit) school in another city and do a runner after you have been paid. Don't tell the school!! Don't tell anyone at the school and be very careful when moving your stuff out, as they often have people who report your movements.
Sounds horrible I know, but it happens.
The above is a 'worst case' scenario.