IF you have a contractual agreement with yoru employer that fully lays out terms and conditions, length of employment (start and ending date) and is signed by both yourself and someone of supreme authority in the company it will trump the minimums defined by labor and employment law.
I'd find out if you have a valid employment contract and if you do the company must strictly abide by its contents, and so do you.
My guess is that you dont have a strictly enforceable employment contract. That is unless you are an athelete or someone that is very much in demand.
Eric

