Airtime Disappears

I bought R12 airtime from Vodacom last week and went to check what purchases I can make for data when I returned to check for airtime it was gone and I did not even get an SMS to notify me my artime has been taken.

I called the call center and the operator on duty just told me I did not turn off background data, that is beside me telling him that I had turned off background data prior to recharging. I have never felt so furious because I had been loading small airtime purchases before that and I would get notifications if my airtime had been taken in the background.

Please help I don't trust Vodacom anymore. Number : **********