call block for "800 Service"

We get half a dozen or more calls each day from "800 Service". There are a million numbers associated with each "800 Service" exchange 800, 844, 877 etc. If you block one number they just use another one to call back. Eventually we run out of space to keep blocking numbers.

We need a way to screen or block ALL 8xx calls.

Our cell phones can do this. It is a simple software change on Xfinity's part to make this available on our Xfinity land lines. Please add this feature.