Welcome to the community, we're glad to look into this for you. Just to ensure that we get this resolved for you effectively, I will need to ask you a few quick questions.
1) Have you made any changes to your services recently?
2) Is your cellular data turned on?
3) Does this occur everywhere?
4) Have you checked in the Fido app/website, if you have reached your allotted data limit?
Finally, please reset your network settings to see if that restores your access.
Please keep the community updated.