The voicemail service on our house number is telling me it is not enabled. That means it's on Xfinity's side of the line. Someone there has to look at the services on the line and fix it. I have tried to call them 3 different times and scheduled call backs because no one is taking customer service calls. You are put in a queue and no one answers or calls you back when you use that service. This is bad business worthy of a Better business bureau and regulatory complaint. How does this get fixed?
You can always report issues to your State Dept. of Telecommunications office if you are not getting resolution after working with comcast. I would recommend that you have documentation of the issue, dates and time that you have contacted comcast, what happened, etc. I had to do this for an ongoing issue that I had and it helped to the right people involved. Good Luck.