Bad service, no communication

I had a wifi router contract with telkom since August 2017,i have been paying through debit order R207, it robs you and only lasts till the 15th of each month even if you dont use it, anyways...then suddenly since August 2018 they started trying to debit R414 i then went to the pavilion to try and get assistance but no joy, they said that they dont deal with accounts, no physical store deals with accounts what type of service is that, they refer me to go online to do things, i sent an sms requesting for my service to be terminated so that i can make a manual payment but Telkom still keeps trying to debit large somes of money from my account that i don’t have, and each time they do that my bank also charges me extra, Telkom service is appalling you cant even get through to their call center which they say is 24 Hours, i want my service terminated so i can arrange to pay balance and be free from this *********** company that only takes money and doesn’t communicate with clients