"Reasonable cancellation fee" of 40% remaining contact

Last year, when I still was a student, I took a contract for students where a person can only enter the gym between 8am - 4pm and again after 7pm (which only came to my knowledge afterwards but anyway)

Before signing final papers with the sales rep, I DELIBERATELY asked whether there are any extra costs, requirements of which I should know since I've already been cheated by Virgin active twice in previous experiences, also that IF I will not be studying next year and I will not by a student anymore that I will have to cancel my contract. He said there is no extra requirements (never to mention the whole 8-4 etc) and that there is just a normal cancellation fee which is not a lot (never to mention that it's 40% of the remaining of the contracts year amount!?!) which will cost me at least already R2800 at least.

Now first, I now wanted to say that Virgin active should really start training their sales reps better, but since it's always been a hidden agenda/fee somewhere, I believe it's no lack of training but deliberately left out on purpose and that there's no ethic and integrity.