MTN ridiculous billing on WiFi usage

I have bought a HUAWEI modem with MTN on contract. I get 10GB daytime and 10GB nightime data and it is loaded onto my device the 14th of every month. It is rather a significant amount I pay for this service. However, in the past 2 months this data package has been lasting me 4 days max!

To my surprise, I contacted MTN only to be told that my laptop is updating!. Fine, i have requested a report to track my data usage because massive amounts of data are being used only to be told my computer is updating. On one day the consultants confirmed on their system that I had used 6GB data on one day!!!! one day!!!!!!!

It ridiculous and I still havent received the report to show me how my data is being used up. The consultants also do not offer much ease because you are told that your device is updating!!!

I am utterly disappointed with MTN and i am on the verge of cancelling my account with them. Honestly, can they just send me this report on data usage? I feel very much cheated by MTN and I am not receiving any help from them which is very unprofessional!!

Can MTN help?