Worst decision!

I proudly purchased a Pajero Sport from Mitsubishi 3 years ago trusting this was a good quality vehicle. I am devastated that my boot door lock system has given up from wear and tear and requires the entire door to be replaced. Seriously! At a cost of at least R7000.00. Surely a door mechanism should last more than 3 years, and I am battling to get my head around the logic of needing to replace the entire door at HUGE expense instead of a latch replacement. I am beyond tears!!!