406-204-4837

(also reported as 406 284 4837 - the 284 was wrong, should have been 204 instead)
Keeps calling and calling, never leaves a message
Caller ID shows "NRA"
I don't think it is the National Rifle Assoc. who is calling from a Montana number.
I have no connection to any NRA.

The same set of initials are used by a debt collection group called 'National Recovery Agency', which is most likely who called you

Possibly this group:

http://www.nationalrecovery.com/
National Recovery Agency
P.O. Box 67015
Harrisburg, PA 17106
E-mail:  compliance@nragroup.com
800-773-4503
___________________________
BBB:
THIS BUSINESS IS NOT BBB ACCREDITED
National Recovery Agency
Phone: (800) 360-9953
BBB® A- Rating
On a scale of A+ to F
___________________________
Records of the Secretary of State for Pennsylvania
Date: 1/3/2015      Business Entity Filing History
Business Name History
Name    Name Type
NATIONAL RECOVERY AGENCY, INC.    Current Name
Business Corporation - Domestic - Information
Entity Number:    687357
Status:    Active
Entity Creation Date:    6/5/1979
State of Business.:    PA
Registered Office Address:    319 S FRONT ST
PO BOX 1115
HARRISBURG PA 17108-0
Dauphin
Mailing Address:    No Address
Officers
Name:    ARTHUR A KUSI
Title:    President
Address:    2491 PAXTON ST
           HARRISBURG PA
          17111-1036
________________
Uses various names:

(1) NRA GROUP, LLC
   2491 Paxton Street
   Harrisburg PA 17111
(2) NRA GROUP, LLC    DBA:   NATIONAL RECOVERY AGENCY
   2491 Paxton Street
   Harrisburg PA 17111
(3) NATIONAL RECOVERY AGENCY
   JESSE R MEGARGEE
   34 E JAMES ST
   P O BOX 6028
   LANCASTER PA
(4) National Recovery Agency INC
   ARTHUR A KUSI
  Title:    President
  Address:    2491 PAXTON ST
  HARRISBURG PA 17111-1036

Harassment calls from the NRA,join or we call you forever!! Great reason to never ever join them!!

It is not the National Rifle Association!  It is the National Recovery Agency, a collection agency.