Poor service on top of incorrect billing!

I had a low airtime balance this morning, bought additional airtime to top up my data. A few minutes later, before even purchasing a data bundle, I have R2.88 airtime left. I didn't go onto the internet, my auto updates are disabled and have been disabled since I started using data 2 years ago. I phoned the Customer Care number 082 111, and all the lady on the phone could say was that I must disable my auto updates and switch my mobile data off. I mean really!! How must I whatsapp or use the internet, as I've been doing for the past 2 years and never had a problem. All of a sudden, my airtime just disappears because of \internet updates"..?? When I wasn't even on the internet."""