Like Ellen says they ask for a person and there's a series of prompts.
First I was asked if the person was there.
Then I was asked if they could make it to the phone. After that, I specified that it was a wrong number. I was told that my number would be taken off their list.
Ironically, they don't have access to Comcast's phone records, since I am a phone customer who pays her bills and not the person they are asking for.
Sounds like a scam, they just called me, and I let it ring. I called back and a computer asks me to enter the number that was called from that number. Weird. Thanks. Keep the faith.