Called left no answer on machine.

Left no msg. Will block.

Automated call asking me to take a survey

Called and Left no answer but I called back.  A message said I'd reached "Hard Data, a polling firm." It gave me the option of opting out of future calls by pressing 7.

Called, but I didn't answer. Less than 10 seconds later, they called again. Answered, and when I heard the words, "brief survey" I hung up.