This call was from a person not speaking understandable English.  Said if we didn't call back we would have to appear in front of a magistrate.  What is this all about?

We do not know who this is.

The number 203-502-7760 is SPAM.  Do not believe anything they say!  The RoboCaller, "David Gray" says they are calling regarding the US Treasury and/or IRS takine Federal Criminal Enforcement Action, asking the recipient to call their number so they can "assist you."  There is no option provided to be removed from their call list.  This number is especially annoying because they call several times a day, as early as 9am and as late as 9pm.  When I call to request to be removed from their call list, I either get a busy signal or no answer.  I have reported this number to the FTC Do Not Call list.  My next call is to my local phone company to have this number blocked, so it can no longer disturb my peace.

Called the number back and got a message saying "the survey is now over" which is happening a lot with these random #'s. Blocked!

This number called both my wife's and my phone 30 seconds apart definitely a Robo call her since our numbers are consecutive some sort of scam most likely IRS at this time of the year

This number just called my work phone but since I was away from my desk it showed up as a missed called.  We are getting more and more spam calls at work and there's nothing we can do as our phone system does not allow us to block numbers.