Xfinity Voice no longer works after porting my landline phone number to Xfinity

Upgraded to a new Xfinity Gateway and turned in the old gateway. We requested that our old land line phone number to become our new Xfinity Voice phone number. App showed both the old and new phone numbers in our account for two days, then the app says that something went wrong and to contact Xfinity. Used the app service to restart the gateway. Internet and other cable services works as expected, but there is absolutely no phone service. I am connecting the phone directly into the gateway phone port (I only have one available port for that) and I get no dial tone. I also get a fast busy signal when attempting to call. X A support is circular and keeps suggesting the same information without providing any useful assistance to resolve the issue.