Got a call from them too. Just slammed the phone.
I have made it a personal choice NOT TO ENTERTAIN ANY UNSOLICITED CALLS.
This has worked and kept me happy so far.
The other way is... if u have the time... just continue asking them stupid questions, on and on and on.... pissed one telemarketer real bad
Eg from another unsolicited call....
"Hello, I calling from XXX"
"Yeah.."
"We want to tell you you won a prize"
"Wah!"
"It is a three night stay at YYY"
"So good, 3 nights... then day how"
"Day also can stay"
"Ohh.... can bring my pet?"
"Cannot think they don't allow"
"Then how about my pillow?"
"Ehh.... (getting pissed) can."
"Ohhh... But if I stay will you be there to check me in?"
"No sir, we will just give the prize if..."
"It's a prize ah? Why I so lucky one? 4D also never strike"
"Sir, we need you to..."
"You need me to collect prize? Can mail to me also can. Otherwise you give me your home address I go collect from you... otherwise...."
(Phone kenna slammed by telemarketer)
So either slam the phone early or waste their time.