I would like if somebody help me to cancel this so called whatever they call it with this company...please

Long time back I received a call from this company asking me to take their discount offer which cost R179 I was refusing to take the offer but they truly insisted and even tell me that they won't take my money if I'm not buying anything but after that they started collecting my money every month and then that's when I decided to end the relation with them I firstly stopped the debit order as I wasn't able to get through them knowing that they will call me after finding out that the debit order has been stopped then cancel the contract with them and the reason why I didn't know exactly who this peoples are as they told me that they're from foschine knowing that I have an account there unfortunately they were lying to me cause I've went to the store and ask about this only to find out that no one knows anything about this,what I realy don't understand right now they have started taking my money again without my consent I don't know how and I can't even get to them please somebody help me because this peoples I don't think their worth it