Hey hi there! I'm Eric from Fido's Social Media. Please note that the view usage tool takes up to 3days to reset after the billing cycle ends. Also if you use tethering this can dramatically increase data usage specially used from a computer. Same thing goes for video and audio streaming. From what you are reporting it might be software related. I'd be happy to help if you could provide me with a few info:
Handset model used
Is it from Fido?
Operating system version used
I'll be waiting for your answer.