Call the Cable Guy. Again.

Comcast, the nation's largest cable operator, has enjoyed explosive growth in recent years as households clamor for broadband Internet and high-definition television that will allow them to exchange family videos over the Web, talk via instant message and order movies on demand. Even with the housing downturn, Comcast's revenue last year rose 24 percent, to $30.9 billion, and it had 24.7 million cable subscribers. That growth has come at a price for customers, public interest groups say. As the company races to add subscribers, many of whom pay more than $100 a month to use phone, Internet, wireless and video services, Comcast has not focused on funding and fixing problems with its customer service, the critics say. Comcast officials acknowledge that the company is struggling to keep up with its own growth.