paid for service plan for 3 years , but claims rejected !!

I was *****ed. i paid for a service plan that guaranteed me 3 services for over a period of 36 months , they only paid for two. when i 'm due for my third one i was told my contract expired on the 01/01/2019 but i took the policy with them in February 2016 how is that 36 months ??? worst part is that i called in December to find out when the contract expires i was told end f January 2019. i took my car yesterday for service and they didn't pay. i wont even bother to extend my policy with such a rotten service.!!!!!