WiFi Calling is very dependent on a couple of things. The Telus backend servers that handle WiFi Calling and routing, your internet speed, and latency between you and those Telus servers. Ideally, you want an internet speed of 15Mbit up and 15 Mbit down to adequately provide an optimal WiFi Calling experience.
If you are new to Telus and if it is within the 14 day buyer remorse period. You can cancel your service without any penalty.
That definitely sounds like a congestion issue. If Telus isn't willing to acknowledge that and do something about it The best way to show them you will not settle for sub-par service, is to move your services over to Rogers.
I have been experiencing the same issues in areas where just 2-3 months ago I had great data speeds and reception. Every time I call they try to make me change my 5G phone to LTE only. I tell them that I am paying for 5G service, in an area that has historically had 5G service and is indicated on their coverage maps as having 5G. Each time I get no resolution or even acknowledgement that something has changed. Its incredibly frustrating and I will be switching back to Rogers in the fall when I buy a new phone.
I'm having the exact same issues!!!! calls constantly dropping, all the time! when it rings, I answer, then I get dead air, no connection. Calls are choppy, I'm getting so angry, its hard to do my job when I can't speak to my clients. I call Telus and wait for 5 min, then call drops. This has only been in the last few months as well, never had an issue before. So done with Telus.