Cannot get rid of a Telkom mobile contract.

Has been trying to cancel a Telkom mobile contract since last year Sepetember.No luck.The conrtract expired a year back.I want to cancel it.Cancelled contract on Telkom web page on 2018/09/28.Last date of service to be 2018/10/29.It was not cancelled.Called call centre once and sometimes twice a month to get the contract cancelled.Then a Telkom agent at call centre cancelled it manually on 2018/11/03.Has been paying contract fees that were deducted from my bank account ever since September and I just got a email with the account for January and the fees will be deducted again end of January.How do I stop this , because working with the call centre and the webpage like was suggested to me by the callcentre.does not work.I also want a refund on this money since October last year , because that was when the contarct was suppsoed to be cancelled by Telkom.Please help.