Account not showing Internet Usage for Past Cycles

When I log into my account and go to the Internet usage, I see this month's usage. However, when I change to the "Past Cycles" tab, I see 0 (zero) GB for each month, despite having uses the internet.

I am suspecting something nefarious. I am subscribed to unlimited Internet. I was checking to see if I ever use more than one TB, or if I can drop the unlimited subscription and save a bit of money. I guess Telus does not want me to do that.

Roger