This also very much works for Americans, actually. Worth remembering. I have had a few calls like this, but this particular one amused me, as I was ready for it:
(gorgeous phone rings)
*ring-ring* (See? Told you. Suspense is everything)
Nameless Telephone Saleswoman: Hi, my name is (made-up name). Am I speaking to Brock?
Me: Yes, you are.
NTS: Oh, good. I hope you are well today?
Me: Do you? That's nice to hear.
NTS: (slight pause from 'nonstandard answer nearly throwing script off) Er, ok. Er, good. Um, I'm calling from Rogers to offer you a special deal on our cable TV package. Usually it is $35 a month, but at present we are offering it to you at $24.95 a month and...
Me (interrupting): Hang on, did you just say TV package?
NTS (enthusiastically, presumably thinking I thought it was super cheap for TV!): Yes, it's only $24.......
Me (Interrupting again): Ah, I won't be interested then, I don't have a TV.
NTS (Having a Grizzly Bear moment*): .............................I'm sorry? You don't have a TV at all?
Me: Oh, don't be sorry, I really don't mind. But it does rather mean a cable package is of no use to me, you see.
NTS (still flummoxed): ......Oh. Er, I see. OK. Well, ok, then. Thank you, and have a nice day....
You could just hear the confusion in her voice, and you KNOW she got off the phone, turned to Cheryl in the next cubicle and started to say "Hey, I just called this guy, and you know what? He doesn't have a TV! At ALL!...
This is not an entirely unusual reaction, actually. Some people react like this if you tell them that you don't have cable. If you then go on to explain that this is because of the lack of a tube to watch it on, they nearly pop a blood vessel. Makes me laugh every time.
*Big paws. See what I did there?