Miami Lakes Auto Mall review: Parts warranty

We are a small automotive repair shop that recently serviced a 2020 Kia Soul with a malfunctioning transmission. Although South Dade Kia is much closer, we opted to purchase the transmission from Miami Lakes Kia since they had it readily available. After replacing the transmission and reprogramming the vehicle, everything seemed perfect — until it broke down again just four days later. The car had to be towed back in for further diagnostics.
We scanned the vehicle and then sent it to South Dade Kia for reprogramming, but they were unable to do so. They diagnosed the issue as a faulty transmission, leaving my shop with a $600 bill. Unfortunately, because South Dade Kia and Miami Lakes Kia operate independently, they refuse to communicate with each other. Eventually, Miami Lakes accepted South Dade's findings and sent a replacement transmission to us.
Now, in order to retrieve the Kia from South Dade, I am required to pay the bill, which I believe should fall under Miami Lakes' responsibility since they sold us the defective transmission. Miami Lakes is refusing to accept responsibility for the $600 diagnosis that was required, nor are they taking accountability for the labor costs my shop incurs to replace and reprogram the new transmission.
Meanwhile, these two dealerships are playing the blame game my customer has been without a vehicle for now an additional three weeks.

View 0 more photos