Can't cancel my Telkom fixed line account

I have been trying to cancel my Telkom fixed line account since October 2018. I have phoned them numerous times this year and every time the agent promised that the matter has been solved and that I won't be billed but still every month I receive an invoice and money gets taken from my bank account. I have confirmations, reference numbers etc as proof but still they can't cancel my account.

I will never recommend Telkom to anyone. They have great mobile packages but because of their bad service I will rather stay with my current service provider. STAY AWAY!!