Canada coverage but unable to make calls to out of province numbers

Touk13

My plan is supposed to be Canada coverage:
Data 15 GB | Minutes Unlimited | Texts Unlimited | Coverage Canada | Voicemail Yes

I once was able to make and receive phone calls between Quebec and Winnipeg but then one day, I could not anymore and kept receiving SMS saying:
"Action required: Your current plan did not allow you to complete this call. Please buy an Add-On https://fizz.ca/s/15/en/14896955/"

Even when using the regional code before...
When I try to buy an add-on for minutes, it is blocked, so I cannot choose any option.
I tried different phone numbers out of province but same result.
The chat with a Fizz "agent" was not successful at all.
I opened a ticket 1 week ago but I assume I'll have a reply in a few weeks/months (?) or maybe never.
I tried everything: software updates, turning on/off plane mode, removing/putting back sim card, turning phone on/off.
Should I just change carrier at this point?

Whizz

Hello Touk13,
I sincerely apologize for the lack of updates on your case.
I’ve reviewed your account and can confirm that your plan does include Canada-wide coverage.
I’ve also updated your existing ticket and flagged it with our technical team for priority handling. 
As soon as we receive a response from them, we’ll follow up with you by email right away.
Thank you for your continued patience — we’re doing our best to get this resolved as quickly as possible.
Thank you for your kind understanding and cooperation. 
Have a nice day.
-Mihai, Community Moderator

Andrei_ref_R7VK1

Try to add +1 before the number and if it's still not working, then only support can help you.