Unable to receive incoming calls

We had Xfinity Mobile and switched to AT&T because they gave us a better deal, but it turned out the price we were quoted wasn’t even close to the actual bill. So we canceled and switched back to Xfinity.

Long story short, when we switched to the new AT&T phones, I transferred the numbers and everything. The two number transfers went through fine. When I tried to transfer my wife’s number, it transferred, but it never fully left Xfinity. The new AT&T phone had AT&T service, and the old one, instead of going to SOS, still had Xfinity Mobile service.

So there were two different phones, two different carriers — same number. The AT&T service was working properly (making calls, receiving calls, messages). When we transferred back to Xfinity, my wife’s phone couldn’t receive phone calls, but she could make calls, send texts, FaceTime, and even receive FaceTime audio calls.

We’ve called I don’t know how many times to get the issue resolved, but they can’t fix it. We even connected a new phone number to the phone, and that number could receive calls normally, so it’s not a phone issue.

I don’t want to change phone numbers. Is there a way to get it working?