Breach of contract

I had enrolled with Mancosa for a part time course in July 2017,this being my 1st semester. Only to now be informed that the extra tutorial classes will be on weekdays as opposed to weekends. As per my application(my contract) we were requested to select tutorial options, which I selected ,weekends. (all correspondence with the college is attached). The fact that I registered for a part time course clearly indicates that I would not be able to commit full time, and weekdays. The college now advises that due to resource constraints, they are unable to accommodate weekend classes. Why offer a part time course with weekend classes if you are unable to meet your obligations. I am extremely upset and feel so disadvantaged.