Just received a call. It rang once and they hung up, no message and no calls after that

Number rang on my cell but I don't answer long distance when I don't recognize the number.  I called from my work phone and message said that I had been chosen to participate in a survey but the time had expired.  Aw shucks.

I have been receiving calls from this phone number regarding promotions and I never asked for it

Received call and picked up but did not say anything with nobody on the other end and eventually the call disconnected to a busy signal. Hopefully wasted their robocall time so they could not harass anybody else!

They called on sat am 10  ,  I answered out of curiosity..a pleasnt lady's voice   told me I had been picked to win a free trip to the Bahams...I  hung up  where do they get our cell #s?

It is a survey company.  If you answer they tell you that you've won something and then proceed to ask you numerous invasive questions until you get fed up and hang up.