Called but did not leave a msg and I do not return calls to #s I don't recognize.

Called but not a contact of mine.

Just received this call on my cell phone. I didn't answer it since I didn't recognize the number. I called the number back using my work's phone and it was "Lisa with Reward Redemption" stating I had recently visited one of their websites and am eligible for a reward. It is a scam, do not answer!

Did not answer....

second day in a row I relieved calls.  I will not answer.  I want to block this number but don't know how