My rear passenger door won't shut neither will the trunk. When I slam it, it still will not close.

"Buying a new door and trunk" would solve nothing. Diagnostic testing is needed to find out why the door and trunk will not latch. No way to tell without performing diagnostic testing. This problem has been occurring for 2 years? What is stopping you from getting the professional help you need? That's the only way to resolve the concern. www.repairpal.com/repair-shops