I actually answered the call and to be honest it was nice to get real customer service from some one who not only speaks my language, but made every effort to make sure I was happy with my installation. The lady said that that would be the only call they would make unless I had a service tech out. It's been about a month now and I haven't received any more calls from Charter and apparently they haven't sold my number as my junk calls haven't increased.
I have received several calls from this number. It rings twice. Hangs up prior to my answering. No messages left. If I try calling back, the message says that the number is disconnected. I'm finding this annoying.