Reception lacking in new development, any ideas who to contact?

You will have to first call technical support... and go through the first line... with all the tests you will be asked to do.

be prepared to argue if for example it somewhat works fine outside but not inside.

that said, there’s one person in the French section that had some problems in the Ottawa region too... Vidéotron ended up saying that the specific region where he is was identified as problematic and they didn’t offered any solutions besides getting a device compatible with WiFi calling