Just got a call from this number. I normally don't answer numbers I don't know but I started a new tactic with them. I answered and then just went crazy pushing numbers on the dialpad. That had to sound nice on the ears. :D They hung up.
Called them back. The robot asked whether I wish to be removed from their database. When I agreed, they asked the phone number... Just filled a complain with the national no call registry - my number is registered with them.