Cancelled contract, still paying. ************

I took out a 2 year gym contract with Werner Nel from Centurion Virgin in Feb 2013 for 3 people, and 1 under 18, he clearly told me that if I am not happy in a year, I can pay a certain fee, downgrade my contract to 1 year and exit in a year. I sent him an email in Dec 2013 to downgrade my contracts. He referred me to the call center saying they do downgrades, when I called the call center, they informed me that no such thing is possible. I figured he **** to me when he didn't respond to any further emails. I continued to pay for something I didn't use. In Feb 2015, I called the call center to cancel all contracts on my account, Blanch informed me that I was supposed to give 20 business days notice and will be billed R28 each extra days. They billed me R509. I thought I was finally done with these devious people, only to find another bill in Mar 2015 for R350. What do I do to get these people out of my life, never want to have anything to do with these ************, ***** again.