Amazing vouchers in breach of consumer law???

I was phoned by Amazing vouchers over a year ago, the salesperson sold amazing vouchers as, I would pay in R100.00 a month and receive the minimum of R500.00 or more vouchers back to use every month, she also mentioned that a friend (name was mentioned) had recommended the system (scheme) to me. I was stupid enough to accept the offer. Shortly thereafter I discovered that the vouchers were absolutely useless to me, to date I have not found one that I could use. I tried to stop the debit order due to this fact but as soon as money is in my account they pounce on it. Short of changing my bank account and face legal action from them I dont know what to do. I phoned them again, was contacted by a person who told me that I had to Pay a SIX month \Cancellation Fee"upfront to have my membership cancelled. Surely this cant be correct?? This company is a total s@@@ and please let this act as a warning to anyone considering falling for their deceit."""