Charged for Cell Phone calls not made on ADSL line

I have lodged a dispute with Telkom today 16/11/2015 ref ***8. I have been billed 2 months in row for cell phone calls made on my ADSL line which I have not made. I was however advised that they will attend to this matter in 6 to 8 weeks time. In the interim I have pay the account which is well over my budget or the line will be locked. I do not wish to be penalized, inconvenienced or land up with a bad credit rating due to a Telkom error. I request that the matter be resolved urgently before I have to make payments which I am not responsible for and cannot afford. a Waiting period of 6 to 8 weeks is totally unacceptable. I look forward to hearing form Telkom and a credit to be passed within the next few days.