UNABLE TO BUY PREPAID AIRTIME FROM APP & WEBSITE

I AM STILL UNABLE TO BUY PREPAID VODACOM AIRTIME ON VODACOM'S APP AND WEBSITE IN ORDER TO GET THE 5% EXTRA AIRTIME!!!! SERIOUSLY VODACOM... I have been unable to buy Vodacom Airtime on Vodacom's website since December 2015. I would like to buy the Airtime on Vodacom's website an pay with my bank card as you then get 5% extra airtime... I have contacted Vodacom on 18 December and they opened up a service request no: A1-XF7T-N6V1HN. I also Visited a Vodacom store in Eastgate in the Afternoon to try and solve the problem but, I was told that my service request had been closed by Craig-Paul Solomons... I tried to buy Airtime on the website again today but, I am still unable... It doesn't give me an option to select airtime on the drop down menu... It only shows Bundles and no Airtime... HOW CAN YOU CLOSE THE MATTER AND SAY IT HAS BEEN SOLVED???