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My ISP actually did once cut me off when one of the machines on the network was compromised by malware. I called up their support line and they told me what had happened, I fixed it, and all was well.

He calls the ISP and they tell him he is compromised. Or they robocall him.

The ISP routes any HTTP request from you to a page that says "your computer has a virus, call your ISP support line to restore access". Of course, that in turn opens up the possibility of someone else taking over your modem and telling you to call this 900 number to fix the problem... :)

Shameless plug: http://www.quarantainenet.com/