Terrible Service from prestige banking

I purchased airtime on the standard bank on Sunday 27 June but unfortunately entered one of the digits incorrectly. I have since contacted Standard Bank prestige bank where I have been bounced around between Transactional Bankers (one moment I have Given, the next it is Joyce and Lewellyn). None of these people are actually taking the time to understand the issue and actually get to the core of the problem which is sad given that monthly I pay a fee to Standard bank as my private bankers to deliver me with such atrocious service. They have advised that Standard bank cannot reverse the transaction and I must contact the service provider being Vodacom. Vodacom have advised that the number the airtime has supposedly been credited to is not in service therefore i must contact Standard Bank but noone at Standard bank seems to be willing or able to help me. My reference is GTS***