Me: Hello
Telemarketer 1: ~pause~ Hello Ma'm
Me: Who is this?
TM1: Hello Ma'm
Me: Yes, tell me. who is this?
TM1: Mam we are calling to offer you a flat in ..
Me: Sorry wait, how did you get my number?
TM1: Mam?
Me: My number, how did you get it?
TM1: Serial wise only I am calling ma'm
Me: Excuse me
TM1: I am calling serial wise.. like 740, 741, 742
Me: Oh so you are randomly calling people and asking them if they want a flat? (in my most non-sarcastic tone)
TM1: *hangs up*
----------------------------------------------------------------------
Me: Hello(this time on my landline number)
TM2: Hello, I'm calling from ING vysya bank, we are offering a home loan..
Me: I'm sorry, who do you need speak to?
TM2: Hello mam'm
Me: Yes, who do you need to speak to, there are four people in this house. Who do you need to speak to?
TM2: Are you a user of this phone?
Me: Yes
TM2: Then I can speak to you
Me: Eh? you don't care if i'm unemployed or employed or a psychotic killer on the prowl.. you'll offer me a home loan nonetheless?
TM2: My management has given me this number and I am calling ma'm
Me: Well you can be assured that we don't need a home loan. Now if you will please be kind enough to take our number off your datab...
TM2: *hangs up*

I think I am on a hat-trick here. If I manage to make one more telemarketer hang up on me I'll take that as a personal victory :)