Missing Airtime

I purchased airtime bundle pay as you go 3Gig yesterday informed today that it is finished . Phoned Samantha at 17h19 this afternoon , she in forms me I was on the Internet the whole day today and that is why I am out of airtime. I went to Sasol Secunda at 10h00 this morning to collect equipment for repairs which I took to our workshop in Kempton Park at arrived back home at 15h00 . When I am not working from home I switch my computer off completely , there is something very suspicious happening here as my airtime normally lasts my a week. I have requested complete records as these internet transactions and was told by Samantha that I would be contacted within an hour by her team leader . So far nothing has occurred , I will take my computer in to Matrix tommorow so they can download the data usage stored on my computer and I will have my attorney supinor the records of these alleged transactions.