2 calls from this number don't leave a message

I got a call from a fellow called "Mike" who asked for a specific person, then hung up when that person was not here. He would not tell me what the call was about. Very strange!

I got a call from this number saying I won a trip to a universal studio resort for 7 days 6 night.  They said I filled out a contest online and all I need to do is pay $249 per adult to get my info sent to me.

I may have filled out something on line but don't remember doing it?

They asked for my credit card #?????

Got 2 calls from this number on my cellphone. Both at 10:40AM when I was at work so I didn't answer. Didn't leave a message either.

They've called twice, they don't actually talk to me, they seem not to hear me and I hear idiots talking in the background.  Everyone else hears me when they call, but these callers are being rude.