Cannot make any calls

I have not been able to make any calls for almost 3 weeks now. I have called the ********** number and each time they have to transfer me to the business department. That a side I have been on the phone with Vodacom the past two weeks a total of about 30 Hrs already. All they told me was that they logged a query and that the technical department will call me. What the business department told me to do was to do the manual network selection and restart the phone and it would be solved, but it wasn’t. Then they told me I should put the sim in another device, and that I did as well, but that did not work. They did a sync on my sim, but that did not work. The rebooted my sim which allowed it to work for about two phone calls and then it was not working again. I’ve even drove to menlyn yesterday which I thought that they could resolve my issue turns out they did not know what the problem. I want to thank all the people at Vodacom menlyn for trying their up most turns out Vodacom it not the best network in South Africa. My number is ********** 58