2018 BMW X4 Engine

I got 2018 bmw x4 and 7year/80000km warranty from the bmw store in vancouver on jun 25,2019.I used to drive to seattle to shopping and eating. I and my husband drived this car from vancouver to edmonton on jun 1,2022. On jun 4,the engine sign and change oil sign all light up . on jun 6 we drived to the bmw edmonton to maintanance.on jun 7 they told me this car eccentric shaft faulty,the car mechanic show us the eccentric shaft already broken ,if i direct drived back to vancouver the engine maybe suddenly shut down or slower down on the highwat.and I must repair car in edmonton and pay total repair fee later back to vancouver to claim the warranty ,i called the bmw store vancouver rep he said ok.that time this car is 64500 km. when I back to the bmw store vancouver to claim this case.they answer me this case is my fault ,i was not done the maintenance for a while, so on july 20 2022 i sued thr bmw store. A trail will be held on oct 12,2022. today i do this complaint i just want to know the reason for eccentric shaft faulty ,what cause this engine problem,it possible make engine suddenly shut down or slower down ,very dangerous ,sometimes somebody will not immediately to change oil. actually i did regular maintance on 45000km,51800km,59000km. just give me a email back before the trail day oct 12,2022 ,thanks a lot.