Worst service ever. **************** billing

I regret the day I took a contract with telkom. I took out a new contract that started in October, from the get go the billing was incorrect. I have been in contact with telkom countless times but Noone can help understand how a contract 1073 has me owing Over 8000 in since months. They have never since I took the contract, charged me the actual amount rather it goes to 1600 or 2000 and now they have attempted to debit me 3100..its the 15th of the month, where am I supposed to get that amount mid-month?? I need someone to explain how I supposedly owe R3200 for a contract of 1073 a month that has been in effect for 6 months. I have called countless times and none of your consultants are able to explain your billing process. According to my calculations I owe R1200. Please update and correct this statement and send the correct one so I can get my account up to date.