Telkom helping them selves to my bank account please help!

So I fisrt signed up for an ADSL line at which after a month of waiting was proving to be fruitless. So I went to the telkom store to try get some answers as the phone option was just a waist of time and money trying to get through to anyone. So when I visited the telkom store the sales person said he cannot give me any feedback with my ADSL installation but he said if took the 4G wifi option he could set me up there and then and no need to wait for any installation. He also said if I take the 4G option he could just cancel the ADSL install that I had signed up for, so I said that sounds great and we completed the paper and he even gave me a printout of the cancellation request for the ADSL. Everything worked with the 4G Wifi router but come month end I recieved my first bill. Wow what a surprise!! Not only was I debited for the 4G account but also for the ADSL line which was never installed and also for a phone landline??? I was obviously realy annoyed I called Telkom over and over eventually I got through to someone and discussed everything. I took his email address and sent the proof that the ADSL installation was cancelled but still they just keep on charging me for **** that was never recieved. So after a year of this theft I have now stopped using the 4G Wifi and stopped paying Telkom as they wont let me cancel. They have now handed my account to some debit collectors and they are now trying to take debits of my acc every week. I now have to make sure there is no money in my account for these sharks to help them selves to. Some one realy needs to sort the ********* out. My advise dont gett involved with Telkom once they have you in there clutches they dont let go.