The feature on my 2016 Silverado tailgate use to h...

The feature on my 2016 Silverado tailgate use to have a soft close when I bought it and it stopped working. I was told by the service tech that it was fixed, but it was not. When I asked him about it he said that the manufacturer changed the part that makes it a soft open because they had so many complaints- I guess he thinks I am stupid! the 2018 loaner Silverado tailgate worked like mine use to- he had no explanation and they didn't fix it.
The other issue was when I brought the truck in for an oil change (specifically asked for oil change) they also rotated my tires that were just rotated by a tire shop, they also charged me for the rotation. When I brought this up he offered to put the tires back where they were and never offered a refund.
I later received an email from the service manager saying if I had any complaints to let him know so he could address them. I sent him an email and never heard back.
My opinion of Quality Chevrolet in Escondido is they should be called "NOT Quality Chevrolet."