DOUBLE BILLED-NOT SOLVED IN 4 months

Middle May I upgraded my phone, but at the end of the month I was billed for my old contract as well as the new contract. I went to Voda shop in Atterbury valuemart where they logged a request for a credit. However I had to pay the amount that I was over charged, otherwise my phone would be cut. I was promised it would be credited by the next account. When that did`nt happen, with my call to call center I was informed it was to late for this month....but it will happen next month......but it did`nt happen. After how many calls to the call center, last Friday a lady promised she will solve it and phone me the Sat....it never happened. Yesterday I was on the line for 20min with call center, I was promised it will be solved and I was given the following reference number: 1- ********** ********** . ONLY TO FIND THAT THE NEXT DAY MY PHONE WAS CUT!!!!! I`m a pensioner and live alone, my celphone is my only contact with the outside world should something happen!!! Last year my phone was ****** and I had the same bad-service experience with Vodacom....it took nearly 2 weeks to get my new phone connected!!!!