missing airtime

I recharged my account yesterday via mobile banking with R12 airtime. I immediately tried to convert this to data( as I have always done and it has always worked) and it reflected that I have no airtime. I phone the customer care who told me that it reflects but hasn't been registered yet and I must give it a few hours. I immediately recharged after that and converted to data. Today I still haven't received the other R12 and phone the data centre where I was told that I used that R12 in 2 minutes which is not true as my mobile data was switched off and I tried converting the airtime to data immediately. I just don't appreciate that the consultant can argue with me over R12 which I definitely didn't get and then tell me that it's his word against mine and his word Is better since it is supported by the system. Very bad service