Lithia Volkswagen Defective Repairs- unwilling to reimburse me for errors they made thornton, Colorado

Consumer's Original Complaint :

Failure to replace a gasket when reinstalling my turbo oil return hose resulted in oil leak and additional repair. Faulty door repair caused damage.

I recently took my auto to an independent repair shop to repair an oil leak and a rear door latch. The mechanic (a former VW mechanic) showed me that the oil return hose had been damaged from a former repair and had been improperly installed as it lacked the needed gasket which was the cause of most of the oil leak. Lithia performed all engine work on my car up to this point and had replaced my turbo in 2008. This same mechanic repaired my rear door latch as the door would not open. He mentioned that someone had worked on this prior as he noticed a loose clip that had been glued in there. This clip had come loose and jammed the latch causing it to break. I have a receipt where Lithia performed a recall on my rear door latches and glued thse clips in place. Both of these reapirs were needed due to faulty workmanship. The service manager did nothing to look into this, expressed doubt this could have happened and eventually offered $150 in dealer credit when my expenses for these reapirs were $780, not to mention plenty of inconvenience to be without my car while these repairs were done.

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Consumer's Desired Resolution:

I expect Lithia to pay for the repairs resulting from the improper installation of the turbo return hose and for the repair of the rear door latch which was broken because the clip they glued in there caused it to break. I also paid Lithia $120 to diagnose the door latch problem. So a total of $780 is requested.I am a reasonable person, a hospice chaplain by occupation. I just want the legitimate expenses covered.