Being billed twice as much

I have been using Telkom mobile for over 2 years and have 2 contracts with them. But ever since I upgraded in October last year I am now being billed twice as much as I am suppose to be billed. I raised the issue after the first bill in November (Case ***6). I was promised that the portion of the money will be reversed in the December bill but that was not the case instead I was still billed double the amount again. <br> <br> I am deeply hurt by this to an extent of my own health. I have called 180 many times and everyone acknowledges the mistake but no action is taken. Even when I ask for the cancellation of the contracts, no one wants to help.