They should give up calling. It takes nothing to ignore the call. If I don't know you; I'm not answering and if you don't leave a message, then I know it was a bull**** call anyway.
I got a call today from this number (I had a lot of missed calls from 727-585-XXXX numbers) and I finally answered this one. They had my info from a contest and apparently I won a trip to Florida! I only had to pay $500 today! Yeah, right....