Wifi calling in my account

I updated my iPhone X carrier setting to Videotron 31.1. I have latest iOS 11.2.5. When I turn my wifi calling on, there is a msg showing up to contact Videotron , and it prevent me to enable it. I chatted with customer service and technical support on line, they could not solve it, they ask me to go to the store. I went to a store, they gave me a new SIM card , and tried on another iPhone to enable wifi calling, the same warning shows up, and it could be enabled. And I am so sad that they launch a function but I can’t use it in my account. And no one from Videotron can tell me what happenes to my service.