INCORRECT DEBIT ORDER CHARGES

I have a Telkom landline for years, which I've been paying via EFT. In August i app**** for Fibre with Telkom, but in true essence of Telkom, the application was successful but was somehow cancelled. I authorised the DEBIT ORDER MANDATE FOR THE FIBRE ONLY. But somehow, even though i approved the fibre, it was cancelled. BUT then i have a debit order now on my landline, which i have NOT approved. AND I HAVE FEES ON MY Telkom landline for it. My statement somehow has a R202 charge for the returned. I NEVER AUTHOURISED A DEBIT ORDER, SO I DEFINELTY THINK ITS UNFAIR TO CHARGE ME. I've spent over TWO HOURS on a call with the call centre and NO ONE is able to assist. i keep getting transfered between sales and accounts. and the call keeps cutting from Telkom's side. IT IS HONESTLY SO RIDICULOUS, THAT NO ONE IS ABLE TO ASSIST!