Looks like ammyy is aware scammers direct victims to their site
http://www.ammyy.com/en/admin_mu.html

How are they getting your numbers? I never, ever get rung by telemarketers. :/

Immediately say, "Excellent, I've been waiting for the call back for days. Should I give you my credit card details?" straight up and see what happens.

Same here, I'm on no private network or anything. I once got a call from a telemarkter on my mobile, was very sneaky as they started off saying "Is Sarah there?" and when I answered no they then when on to say "oh sorry then, wrong number, but are you interested in blah blah anyway".

This!

How are they getting your numbers? I never, ever get rung by telemarketers. :/

i rekn they start with auto-diallers & get a bunch of numbers from a range.

about a year back i used to get heaps of them, always asians saying they are from microsoft support to fix my virii. i cancelled my home landline about 6months ago & never get any telemarketting calls anymore. voip + mobile ftw.

I picture it going like this:

them: hello sir/madam I am from tech support, we have detected your computer has a virus
user: wow, a virus? really? good thing you're on the ball. how can I fix it?
them: well first I need you to open windows
user: all of them? it's winter, and cold, if I open all my windows then I too will have a virus
them: no, your computer windows
user: my computer is solid steel, there's no windows in it. I don't need to see what's in there
them: ok on your desktop you should see "my computer", I need you to..... *interrupted by user*
user: why would your computer be on my desk? are you suggesting I've stolen your computer? I'm insulted.
them: *beep beep beeep beeep beeep*

Last time I got one of these idiots I just said "are you aware what you're doing right now is illegal and you are breaking the law" and they immediately hung up.