Laptop Disaster

I gave my laptop in last year around October for repairs. It was purchased in February the same year, so it was still under warranty. I am a production manager at a international company, so I understand customer service and contracts. The company refused to repair the laptop on the basis a third party already switched internal parts. I was furious when I got this response, eventually from the customer service department. When I got hold of the manager and explained this issue with him, he guaranteed me that there would be an investigation regarding this matter. I am still waiting his response. I can't believe this company can lie through their teeth and think they can get away with it. Now in January I collected my broken laptop from them. I will make sure I tell everybody I know about my experience with this company. This was certainly the last money they will ever see from me. One day I will dance on their grave!!! They just made the worst enemy out of me.