Here we go again

About a year ago i complained on here and vodacom to this day have not explained to me what happened they just gave me a credit on my account, Today i presented a seminar at work left my wi fi hotspot on by accident but my account went up by 10k in that time according to the vodacom app. The problem is i didnt present from the wifi everything was pre uploaded at work and the presentation was done on the network at work. there is no reason at all why my account could go up R10k in a few hours!!!! I always pay my account but this is ridiculous. I do have databundles on my phone. Phoning your call centre is never a joy. from last time i had no explanation eventhough you at least credited my account thanks. When you phone back you have to explain the story many times because its a different agent every time and they always tell confliting stories. I need help!! Please tell me the app is wrong! terrible!!!!