Telkom Mobile Network Fail

We took out Telkom Mobile contracts as they provided great network in our area, on 1st July they decided to change roaming partners leaving us unable to make or receive calls. My hubby & i have called every day for nearly a month and today i was informed they closed the case last week as they cant get hold of us! I have called daily this week and this is the first i heard about our case being closed? Spoke to a supervisor who was rude & condescending and more useless than the callcentre agents i have dealt with! I am absolutely livid as every time i call they have no answers as to what they are doing to resolve the problem. No doubt my debit order will be taken off on the 1st and i will have to continue paying for a service i am not receiving?