BEING BILLED FOR SOMETHING NOT IN MY POSSESSION!

took out contract with telkom, the totally unlimited plan. in 2015. after checking my invoice etc get to know that i am being billed double (2 unlimited plans with 2 handsets..) incorrect! as i only signed up for one, and i only have one in my possession. after many emails and calls to the 180 number, speaking to different people in the call center, 4 months down the line and no progress. in the emails, responses i received was that its under investigation. fine. but 4 months and still investigating!!! please come on, be professional. do not consume and devour someone elses hard earned money. on the 1 march, phoned telkom again, put on hold 3 times, spoke to 3 different people (pochia, tebogo, clyde) still no concrete solution. only to be put on hold again and cut off... this is no service at all. despite having a case number and submitting it on email too. still no progress. i also suspended the incorrect number on the telkom customer login, then too i am being billed... any way to resolve this!!!