unjustified enrichment n its unaccetable

In 2013 I signed a contract with Virgin active for a year in October 2013 in Humewood Port Elizabeth. The contract was explained to me and I told them I am moving to Pretoria in January. To my understanding the contract was suppose to end month end of September. The membership fee went on for 3 more months. In December I reversed the payment and had to pay bank charges. January something happened and on the 02 of February I went in on one of the branches in Pretoria CBD Tremshed the receptionist told me I was suppose to call at the end of my contract and inform the company he then said the guy I signed up with was suppose to tell me and HE DIDN'T . The guy never told me and I actually fail to understand the principle behind this clause. What is the point of signing a contract for A YEAR if I still need to remind a huge company like this that its been a year. I had to pay the membership fee I reversed in order to cancel my contract, just when I thought finally am done with this company at the end of February money was deducted AGAIN in my account. Now on my student account I have an overdraft because I did not have sufficient funds. This company has been enriched at my expense