comcastic \COM-cast-ic\, adjective:
1. Denying ones customers the use of services paid for in advance.
2. Lying about actions that result in the above.
How do we get this definition? It evolved from
news reports that document the effects of Comcast's recent activities:
Each PC gets a message invisible to the user that looks like it comes from the other computer, telling it to stop communicating. But neither message originated from the other computer - it comes from Comcast. If it were a telephone conversation, it would be like the operator breaking into the conversation, telling each talker in the voice of the other: "Sorry, I have to hang up. Good bye."
That gives us the first definition, the second definition comes from a
leaked memo by a mole
inside of Comcast.
Put it all together, add in across-the-board crummy customer service (experienced first hand here), and you've got something that's Comcastic.