Who called from 4133370205

I just received a call yesterday.  I did some of the survey.  (had the time)
What should I do now?

how do you know this?  I gave information

received call from said number, was not available to answer call, no message left.  I called the number back as I do know some people in mass, got a recording that the number was no longer in service about twenty minutes from the time I recieved the call. Emailed the cdc concerning the other reports that I have read.  Will follow up with phone call in the morning

i got the call on april 8th and also last night. they didnt leave any messages. i havent answered the phone though.

Call from 413-337-0205
Didn't get to the phone in time, no message left.  This isn't the first time I've been called by this #