Why the data usage is shown as way more than the actual?

Android user here, the day I popped in the SIM, android started keeping a track of my data usage. It is currently at 580mb~ as it has only been 8 days. Sounds reasonable.
I go to the Fizz usage dashboard, I see that I have used 2.8gb~.
I question myself if really did use 2gb - well I could not have, as my phone is mostly connected to wifi.
Any ideas? Where can we report this to?
Same issue reported here > https://www.reddit.com/r/FizzMobile/comments/a2bd08/fizz_is_shorting_me_on_data_usage_im_out_3gb_of/?utm_source=reddit-android


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