"We're sorry, the number you have dialed has calling restrictions that has prevented the completion of your call, announcement 19"

Twice today I was on the phone with someone when the call was interrupted with this message. I wasn't placing a call, I was in the middle of one, and after the announcement repeated twice it disconnected my call. After the second one I called Xfinity mobile to find out what was going on and it happened the third time so I never got through to anybody. Anybody know why this is happening and how I can might fix it? I'm on an Android Motorola phone with Xfinity mobile. I seem to be able to receive and make phone calls and texts without any problem.