2015 wiring harness

[07silverado]

Hello,I was curious about a "fix" a dealer performed on my truck. In November 2016,my 2015 Silverado z71 was 12 months old and had less than 15,000 on it. The check engine light came on so I took it to my dealer. When hooked up,it gave out many engine and transmission codes. They told me to come back the next week for a fix. What they found was a damage wiring harness caused by it rubbing against a pump pulley.They repaired it. I thought that was a cobble job and told them I wanted a new one. They claim a new one is not available and their"fix " is adequate. I got no help from G.M. They say they do not have one. I say ...build it then !Am I right about wanting a new harness for a 45,000 dollar truck ?Thanks in advance.