Installed the GM CAI on my 2019 silverado 1500 couple weeks ago, then took to the dealership for a re-tune, but then they tried to charge me for labor for re-tune but i showed them the labor code and receipt and insisted the labor was included in the purchase price. They honored it that day but now calling me back saying that there is no labor included and they were wrong.
Anyone who's been through this process know how i can explain this to them? or what do i need to show them exactly?
thanks