Bridge of contact

Okay here goes... I entered into a telephonic contract with the company in 2018. I remember speaking to Thembisile Nxumalo, and she sold me a deal for R139.00 (11GIG +ROUTE). I agreed to the contract and issued my banking details for an option of debit order. I specifically told her to debit the monthly fees from my bank account. Telkom did not debit. I called the call centre and I was told to got to the nearest Telkom outlet and I went to the one in JHB Main street, that is where I was given a long reference number to go and pay at Pick n Pay. What I find odd is the gentleman at Telkom told me that they tried debiting from the account but there wasnt money in there....! I asked for prove, but they couldnt assist, I told them to debit again and they did not do it. I also asked for the recording since I was told that the calls are recorded and can be made available upon my request, and to this day no one has contacted me but they keep sending invoices. Telkom has bridged they're own contract by not deducting their montly instalment from my account and now my credit profile has been affected. I cant be having a balance of R2800 when I never got to use the DATA because the Sim card got blocked due to outstanding amounts. The only thing I have in my possession is the Router, which is what I am willing to pay for.