Amazing vouchers is a ****

Reached an agreement with amazing vouchers last year in April they started debiting my account in May as agreed they debited R79 plus R99. I noticed in January 2018 that they have been debiting R99 three times a month , when I called them today they claimed that it's nor them that keep on debiting my account, but I asked why they keep on changing reference numbers when they debit my account. I asked to cancel and Grant the agent said I need to pay R600 for cancellation that time they have been taking way above what we agreed on. Spoke to Grant for a while then he finally decided to dismiss me and tell me he will cancel my services but I'm still waiting for confirmation from him that he cancelled this contract . I really wish that the was a way that this would be sorted or a way that this company could be closed down because me and my sisters signed up for it at the same time and they seem to be having the same problem that I am having. This company makes me flippin sick