Nice long detailed story. Sorry to hear about all the hassles.
That's some tough breaks.. You should have had a PPI done (on all used vehicles you purchase.) Live & learn on this one.
Best thing now is to have a itemized list of all components that needs fixing and all the parts that was "supposedly" replaced under said warranty. Post the list and we'll be able to help you figure out what's BS and what's fact on what else you need to do to get your car up to spec.