Deduction even after contract has ended

I joined sbk gym in Atteridgeville in October 2017 on 12 months contract but my health did not allow me to continue with them. I realised that I was having low blood on the first day when they check my blood pressure. After a week with them I fell ill I went to Thato who recruited me to allow me to cancel but they refused and told me it can only happen after 12 months.so they continue deducting money from my account hoping that they will stop after 12 months but no I went to the gym to let them stop again in June this year but to no avail I even wrote an email but dololo I went to deliver my written letter but to my surprise this month on the 15th they deducted again. So I don't know what to do with is SBK thing. So please hello Peter tell this people to stop doing what they are doing to poor people like me.,and my advice to people especially in ATTERIDGEVILLE please don't ever try to fell in the same trap, stay away from SBK