I have no service today. How to do with it ?

wait and follow this page
https://fizz.ca/en/faq/status-services

https://fizz.ca/en/faq/status-services

At least their web service here works, if not, how and where can we complain?

March 25, 2019 - 7:45 am We noticed some instabilities on our network, which would explain why some members cannot use their mobile services. We’re currently investigating to pinpoint the cause as soon as possible.

March 25, 2019 - 9:45 am: Fizz is aware that some of its members cannot use their mobile services. The issue has been identified and a dedicated team is currently working to address it. Fizz apologizes for the inconvenience this may be causing you.

March 25, 2019 - 10:45 am: All our teams have been mobilized and are working relentlessly to address the situation. Fizz apologizes for the inconvenience this may be causing you.

This is unacceptable. I'm a freelancer and can't call my clients.

Same here. This outtage has cost me a lot of money today. I guess I've learned my lesson trying out new and smaller providers...

For me, mobile service is completely down. Some areas like Ottawa still working.

Fizz must be doing a reset. Roaming doesn't work either now.

At least Fizz is posting updates to keep us informed every hour.

Check here for status updates: https://fizz.ca/en/faq/status-services

I keep a 2nd mobile line as backup with another provider. It's been pretty reliable also prepaid, similar to Fizz. I hope Fizz improves soon.