ECM damaged and would not repair

I took my 2007 Dodge Ram 3500 (30,000kms) in for a factory upgrade on the ECM. When the mechanic was finished I had a frequent engine light display. I also had a leaking valve cover gasket. When I returned to the shop, I mechanic sold me a cabin filter, and gas fuel filter. After that failed to fix the truck, I was told I would need new batteries even though I had my batteries checked elsewhere and they displayed an normal charge. My valve cover gasket was still not fixed. This went on over a period of 5 months, I bought new parts, and made several trips to Kamloops driving over 100 kms in winter conditions, just to be left sitting in the lounge for hours, and then being told that they didn't know what was wrong even after I paid $80.00 for a diagnostic that threw a P2509 code. Finally in desperation I called the BBB and Dodge Canada, then went to Kelowna Dodge where I had the truck serviced, and all they did was clean the battery cables. We told them right from the beginning that we believed it was the ECM because the problem started after they upgraded it. Our valve cover was still leaking. After much debate with Dodge Canada on the line they agreed to take the truck and keep it until it was fixed. A week later we picked it up after they replaced the ECM and fixed the leaking valve cover. I met a man at Kelowna Dodge who couldn't speak english very well and he had a similar problem with one of his sensors, possibly the ECM and had paid for 8 diagnostics at $90.00 each and his 2004 car (48,0000kms) was still broken. I told him to contact the BBB and Dodge Canada. I explained what had happened to us and he said he was going through the very same thing. I know things are slow in the winter for these shops but hijacking someones vehicle and making you pay for parts you don't need is total B.S. I would never darken there doorsteps again.