Outrageous cancellation fee

hi<br> I entered a 2 year contract with virgin active earlier this year and after having to deal with poor service I've decided to cancel, only thing is 'reasonable' cancellation fee which I signed for turns out to be 30% of future fees which as a student I can't afford. The CPA states 'cancellation charge may not have the effect of negating the consumer's right to cancel a fixed term agreement.' yet this fee just leaves me stuck with them till the end of my contract. I really don't think it's fair