I am being harassed by the caller with consistent calls leaving no messages either. Hypocrites hide behind Toll Free numbers to harass innocent people and I hate this. I need a stop to these calls please. I work in a Law Firm and I AM NOT IN DEBT TO ANYONE!

>> I work in a Law Firm <<

Um.  Then, you are in the ideal place to learn what to do to stop those calls!
How do you know the calls are from a debt collector, if there are no messages left?

They are a collection agency for the city trying to get you to pay your unpaid parking tickets. If unpaid they CAN NOT and WILL NOT affect your credit rating, all they can do is harass the crap out of u with annoying mail and phone calls from numerous different numbers. Their name is ARC or Accounts Recovery Corporation!
Just ignore!