Who called from 2045785390

Called me - did not leave a number.  Has anyone called them back to see who they are?

They called asking for Mark. I also got a call from 561-692-4404 asking for Mark. They hang up before I can ever ask who they are.

They called me today on my cell phone.  Left no message.  When I tried to return the call I got a message stating the party had their "do not disturb" feature engaged and was not taking calls.  
Guess these Canadians are busy calling people in the US and just hanging up.  Idiots.

just called me. Did not leave any voice message

I also received a call but they did not leave a message. I called them back and it is a SCAM company trying to get you to add minutes to your phone by using a credit card. They get your number and make charges to your phone.