Presuming you have some documentation of some sort on what Comcast owes you (like a copy of the promotion advertisement and your statement showing you signed up), you can contact Seniors Vs Crime - either office in The Villages - and they can help you out. As a snowbird, you can do it by email, mail or fax. Their email is
MarionSVC@yahoo.com or
SumterSVC@yahoo.com, depending on which office you want to use.