cancellation

I took zone fitness last october, with this lady and she told me that you guys will not start deductions without my approval, I've never even used the gym even once, how does your people system work can't you people see that a person has not or never tagged in at the gym stations??, because you also offer access cards? .I spoke to this guy, I asked him to cancel it, because I got a debit order in november, He told me that its cancelled but funny enough you guys were still debiting even this year, so I thought it was a system error, because I was reversing the money, yesterday I received a email stating that I owe R5000. This is total madness, I'm gonna sue you people if you don't fix this. Because I can't pay for something that I didn't even use.