@Sherbert1
What is the make and model of your phone? Did this problem start to occur after February 22nd? If so and you have a VoLTE capable phone then it's likely related to the introduction of VoLTE for pm customers.
Before February 22nd or the date that pm provisioned your account for VoLTE your phone would have used the 3G network for voice calls. It sounds like the building you work in impedes the 4G LTE signal.
As suggested by @DennyCrane you time try switching to 3G only then check your signal strength by going to About Phone>>Sim card status>>Signal strength>>__dBm? For 3G you want to see -60dBm to -80dBm but you should still have no issues with a weaker signal down to -99dBm. Once you hit -100dBm or lower you will have issues or no service at all.
What's the difference in signal strength for both 3G and 4G LTE inside and outside your building and near a window or farther inside? If the signal outside is good the solution may be cell signal booster. Fairly easy to install and reasonable $100 to $200 on Amazon.ca.
Do you have a former telus phone? It was provisioned for wifi calling....does it still show wifi calling as provisioned and enabled on your phone? Strangely the bf was able to use wifi calling on his former telus wifi enabled Sonim XP-8 on our home wifi (w/telus) while his account services were suspended by pm.
Take the time to do a little testing and experimenting to if a solution can be found. If not and given a compelling enough reason to have to port out your phone number especially if it's back out to telus you may be able to get a willing CSA to save your account+$$ rewards with a new phone # and port out your work phone # to telus if that's your only choice. (But very YMMV!) Do you happen to have a dual sim phone?
