Telkom System

Hi, I have a serious issue with Telkom, i took out a Data contract 20 g day and 20 g night in Potchefstroom in 2017, in 2019 i moved to Stilbaai in the Western Cape no data coverage, i went to Mosselbay Telkom and took out an additional contract which i can use in Stilbaai, the lady informend me that the 20/20 contact expires at the end of Nov 2019, i said i will honour the contact but to cancel it at end of term, she assured me that will be done and entered on her system, low and below the contact was not cancelled but extended with out my permission, I have send six e mails to find out what is going on, no reply, never received one invoice for the 20/20 but a few for the new contract, i informed them to cancel my whole acc, Used the App .Phoned,E mailed but still deducting the money off my acc. I have reversed the charges, was immediatly phoned explained , nothing happend. now what must i do change my bank account what a mission, can somebody please help me they are *****ing my money