Telkom Billing Department

Telkom loves getting clients, but i have been fighting with then for over 4 years about a mistake the BILLING DEPARTMENT made. Now they are making it as if it was my fault when a consultant admitted to me over the phone that the fault is on their side. I refuse to pay any form of money for a mistake that was made within the department that handles the debit orders. They have now blocked my opportunity to be able to get a car, and I have had just about enough of their BS. SO now they have added some random number which i have never owned in my life on my account because the other money they had to write off. Yes, i have tried talking to the billing department, trying to get hold of them is like sitting jobless but wanting to be rich. It doesn't work. Just imagine if they are doing this to me, how many others out there are they doing this too??? Please I'm posting this so that others don't fall victim to Telkom's **** and USELESS department that try to pocket money but just randomly adding numbers to peoples accounts.