Mont. Code Ann. § 33-15-1121
Unfair trade practices
33-15-1121 . Unfair trade practices. (1) The failure of an insurer to comply with this part constitutes an unfair trade practice under 33-18-1003 .
(2) Midterm premium increases and policy coverage reductions not in compliance with this part that are attempted or executed constitute unfair trade practices under 33-18-1003 .