just called me today....I didn't answer...hope they will stop

The company is called REIS.  They do phone surveys if you own apartments or commercial properties.  Don't pick up, or they'll bother every day.

who called me from this number called me 3 times?

I called back and it was a place called REIS and I was able to have an operator remove my phone number. I have no idea from there if they sell the numbers we give to other spamers or not though as get 2 or 3 calls a week from different advertisement sometimes scams but usually companies just selling stuff that is perfectly legal but just annoying. So I just offered it up to God for a sick teenager I know and let the stuff annoy me. It helps though to say nonsense into the phone so they may think you are an oddball and not call back. I tried delivering a 1993 news broadcast today when someone called from a clearance house. I used to send goofy emails back as well for spam emails and then I learned they sell my email to other spammers and eventually my computer can get virus' so I stopped.

Just tell them to remove your number.  They don't stop calling as long as you have a voicemail.