billing fault from Telecom, client now has to bare interest

I have a problem with the complaint i lodge, the respond is truly not satisfactory as it is blatant lies from Telkom....fact is Telkom never debited the money from my account in January and not my account is in errors with the interest that i have to pay. I had funds in December and January of which I have statement to proof. I did not have a problem of paying error Telkom did by not debiting in January my concern was the interest to pay for Telkom’s fault. I have now called the call centre 8 times and none is willing. to accept the fault and make this my problem ( i also need calls in made with the 1st consultant as well and Mduduzi and Sabelo 14.02.2018 02?29 PM)…this is ********** from Telkom and I will not rest till this is resolved amicable