Failure to resolve query

I signed up for a Telkom LTE contract in March this year. On receipt of my monthly accounts I noticed that I was being charged for calls made from a number that doesn't belong to me. I have contacted the call centre numerous times over the past three months but they keep transferring the query to different departments and have not been of any help at all. Last week I received a call from a Telkom consultant advising me that they can do nothing further to assist, and I need to go back to the store where the contract was issued. I then went to the Gateway branch and the consutant there advised that she can also do nothing to assist and I need to contact the call centre yet again. I then received an sms stating that my case number (***4) has been closed, yet the problem has not been resolved.<br> Why is it so difficult for someone at Telkom to track down the person using the line and transfer the account accordingly? I am now sitting with an account in arrears due to their incompetence. <br>