I hate Cold Calling Robots

Me: Hello
CCR: Hello, am I talking to the owner of this phone number?
Me: Yes
CCR: I'm guessing you also have a mobile phone?
Me: Lucky guess.
CCR: Could you tell me roughly how much you spend a month on your mobile?
Me: I don't see how that's relevant.
CCR: I'm just looking for a rough estimate.
Me: Sorry, that's not information I give out to someone I don't know.
CCR: .........dialtone