Telkom Failure to resolve account dispute

I have lodged an accounting dispute on the 11th of April 2019 with Telkom because they billed me for 6 international calls which i did not make. I have a line with them which i only use for ADSL i do not even own a telephone nor did i ever make a phone call using the line. Today is the 21st of May 2019 they have not provided feedback.

I do not take calls when im at work and i provided an alternative number of someone that i live with that uses the line so they would be able to get hold of someone should i be unavailable as the account holder but to date no update and no response from them.

When i contact them to follow to follow up the just tell me they are escalating i wonder if they have 100 escalation levels because i sure followed up a 100 times.

Their service is poor and pathetic.