When we had as one of our secondary companies an internet service provider, I had lots of fun with the phone companies wanting us to change to theirs. I'd start asking all sorts of questions about how many T1 lines could we get and what sort of broadband service did they offer. When they got all quiet, I'd say well we are an ISP, we need blah, blah, blah...and that would be the end of that till the next month when there was a new person asking it all again.
We generally pass the ones who won't give up on to our boss who proceeds to tell them that we are a corporation and everything is handled by our corporate office. Then he proceeds to give them the phone number, which just happens to also be for the newspaper/radio station.