Received call on my cell phone. Caller ID was Phoenix, AZ. Did not answer. Caller did not leave message. Blocked number.

just got a call, did not answer not a number we know of

Received three calls first time a male voice wanting to do a survey. Refused and hung up.
Two more calls and who ever it was never left a message. So I blocked the call.

These (people???) called three times yesterday.  I finally answered and a female voice said something about a survey.  She was hard to understand because of heavy accent.  I told her NEVER to call our number again - was I CLEAR!!! - but  she continued to prattle something about why her survey was allowed..blah,blah, blah.  I hung up.  .