Hello @PoutineLover,
Welcome to the community!
You can save your billing detail from the MY ACCOUNT section on fido.ca. See this article here for instructions on how to save your invoice.
You can see the last 18 months online anything older you will need to contact customer service, I'm not sure how far back Fido keeps invoice records for.
You can contact customer service through any of the available methods listed here.
I saw your other post and I hope you get everything resolved.
