This number has called me non stop both my cell and employer threatening to call the "law"

Contact your phone service provider and file complaints of harassment. Follow up with the local LE as well. The phone company can block this number or better yet, google call blocking apps, maybe one will work for yours.  They do make call blocking devices also, maybe one will work for your company or maybe their phone service provider can fix them up also and block this.

This number has called my job and my cell was very rude to my employer

These people sent me an email stating there company name is Law enforcement department. And i owe 925.00 but the only way you can pay is threw green dot money pak.and the contact person is Mark Davis. .

Total scam. Phony Indian debt scam.  Claim to be with some federal or state department.   Threaten you with  all kinds of legalistic mumbo-jumbo and then tell you that they can make the whole thing go away if you just pay them X amount of money.  Requiring a green dot money pak (which is untraceable)  is a dead giveaway that this is some kind of scam.  Don't pay them anything.  Ignore their calls.  Block them.   Do not pick up on calls you do not recognize.

* File a complaint with the FBI on their Internet Crime webpage     http://www.ic3.gov/default.aspx