Incorrect Billing

I loaded BIS for R60.00 on 04/11/2015 and to my surprise when i access watsapp or facebook , it charges from my airtime and not the BIS. I called MTN to enquire about the matter at hand , I spoke to the lady by the name of Zuraih Carim and guess what , she told me that they can't pick up any records on their system that i have loaded BIS and also loaded airtime (of which i did numerously) , I asked her what is the way forward , should i just keep loading airtime for it to get used up when accessing the internet whereas i have BIS ? she told me that she will take it up with her team leader .I called back today 18/11/2015 and spoke to another lady , and when she checked on the system she saw that i did load BIS and airtime . i was shocked to find that there was no note on the system to show that i made a call to the contact centre and i was transferred to the technical department only to find that i have been put back to the queue .I AM SO DISAPPOINTED AT MY SERVICE PROVIDER FOR NOT PROVIDING A QUALITY SERVICE .<br>