LOL, you'll never get rid of them now :(
I have a friend who loves telemarketers, once he gets the call he will ask them to just hold on for a minute while he stops the pot from boiling over on the stove, then goes on with whatever it was he was doing before they called lol.
He'll usually wait 5 minutes before putting the phone back to his ear to check if they're still there, then hang up lol.
His theory is if they are happy to waste his time, he's happy to waste theirs.
On a serious note, thee types of scams are very common. Chances are if you haven't found one or two in your inbox as yet, you soon will, so just be ware that you haven't won lotto and ignore it lol