Shady Hardwired Radar Detector Install

Location: San Francisco.

I went to a Bay Area installer last week to have an Escort Redline Ci radar/laser system installed in my brand new Porsche Macan GTS. They also installed sound deadening in the doors and trunk bottom at my request. They agreed to a cash price:

$3500 parts for the radar system
$3500 install labor
$2200 for sound deadening parts and labor
$200 to hook up a dashcam I already owned

The total is in writing without itemization. The credit total they offered in writing was $10,200.

I picked up the car on Thursday and immediately noticed shortcuts had been taken in the radar installation. These are not things that a high end shop should do while installing what is supposed to be a stealth radar system:

- The rear laser shifters were mounted on the red reflectors. They claimed it was because the bottom lip of the bumper was not horizontal. A high end installer would have 3D printed mounting plinths for the shifters and in fact the estimate said "3D print mounts if needed". In doing this, they drilled through the rear lower trim, which is a $1200 piece that requires 1-2 hours labor to install.

- They mounted the control button panel on the plexiglas surface of the console - right on top of touch sensitive "buttons" that I can no longer press.

- The front radar receiver is intended by Escort (according to their documentation) to be mounted inside the front bumper, out of view. This requires removing the front bumper. Instead it was mounted to the grille, fully visible and they didn't take off the bumper.

- The GPS receiver is mounted on top the dash. While this isn't outright wrong, a better installer would have mounted it inside the dash, invisible.

- The interface box ("brain") has a 2025 manufacture date according to the serial number, but it is running firmware v9.28 which is extremely old. Gemini thinks the likely explanation is that this is a refurbished unit and that is the test firmware used during refurbishment. I contacted Escort with the serial number for more info and am waiting to hear back.

- On my way home I got a flat tire. It was a screw from my own fender liner that was stuck in the tire. I found two screws missing from the fender liner. I had to pay $25 for a plug, but the puncture is too close to the shoulder of the tire and I am waiting on a replacement tire. That will be $500 for the tire and $100 for installation.

I looked up the shop on DCA Search and they do not have a BAR license, and their Bureau of Household Goods and Services license is delinquent since 2024.

The owner offered to clean up the installation including hiding the front radar receiver for 4-5 hours labor after I told him I expect compensation for the tire. He wants to plug the rear lower trim and thinks it is unreasonable to want to replace the part.

It seems like I have leverage to get my entire $9400 back at least. Can anyone shed light on what my rights are here and how much leverage I have?

Thanks!