General Motors review: error code 0008 2008 pontiac gxp 3.6

I am sending this correspondence regarding my 2008 Pontiac Torrent GPX Vin #2CKDL637286060698. I purchased this vehicle new in 2008. Since that time I have been disappointed in the number of major failures that have occurred since then. To name a few the heater core had to be replaced. This was a major job that required removing the entire dashboard from the car. This was not covered under warranty and I absorbed the entire expense well over $2, 000. I had to replace the windshield wiper motor at my expense also. At approximately 80, 000 miles the Transmission expired. I took it to Jim Salerno Dealership in Randolph NJ. They told me it was out of warranty and it would cost me $3, 600 to replace. I filed a complaint with GM and they agreed to absorb a partial amount of the replacement. I ended up paying $2, 600 when the repair was completed. However several months later I received a check from GM for the $2, 600 I paid to have the Transmission replaced. On April of 2016 the check engine light came on. I left the car at Jim Salerno service center. A day later they got back to me and said the car needed new timing chains and it would cost $2, 584. The car had 97, 787 miles on the odometer. I again contacted GM regarding the fact that I had owned many GM vehicles and drove them for well over 100, 000 miles and never had a timing chain issue. In fact I have a 2006 Cadillac SRX with the 4.1 Northstar motor. It has over 180, 000 miles on it and other than normal repairs I have not had a timing chain issue. So once again GM stepped up and absorbed $1, 200 dollars of the repairs under warranty. I paid $1, 284. Now three years later and approximately 30, 000 miles the error code 0008 has appeared. I again went to Jim Salerno and was told to leave the car for diagnostics. I said ok but what id it needs timing chains again. I was told I would have to pay to have them replaced. When I challenged the service writer that they were replaced only 30, 000 miles ago he told me they didn't design them they just fix them. I asked to speak to the service manager but he was not in. I then spoke to a gentleman named Matt who assured me he would discuss it with the Service Manager. I waited one week and contacted Matt two days ago since I had not heard from him. He said the service manager was contacting his GM rep and was suppose to get back to me. Matt called me back and said the GM rep was busy and that I would get a call from the service manager. I am still waiting for an answer . I am seeking help from GM to resolve this situation appropriately and honor the replacement of the timing chains if they are in need of replacement.