Airtime disappearing all the time

I recharge all the time and everytime I recharge my airtime goes missing. I call the call centre only to be told the same thing that the system hasnt updated and yet I never get my airtime back. They think we dont know that this is all a script that they are told to say to us after VODACOM has ****** our monies. I hardly ever recharge on this phone and use my Cell C number as I never have \system issues"with them and whenever i recharge on this vodacom number they must always be issues. To people reading this I hope the next time you decide to buy a phone you use MTN or Cell C and stay away from these Vodacom *******. Vodacom has ****** my money way too much and I refuse to keep quiet"