Service sucks and cant resolve jack ****!!!

Hi, where do I start. I have called Vodacom customer care so many times i have lost count. One simple problem that no one there seems to solve. I have R937 airtime that I cant use, when i make calls it says insufficient funds. Really, not joking at all. If you go down all the reviews its *** service a person gets doesnt matter how nice they sound over the phone but they solve nothing. Ma'am its been escalated, Ma'am we working on it. Ma'am do this and that and nothing works. And the joke of it all is that im on prepaid. Cant make one call to save my life. They the most expensive network you can find but clueless with solving problems. Im so gatvol, so gatvol. Cant throw away the sim coz R937 is not money I can afford to just give away,