In Ressler's defense, they are following Toyota's guidelines by the book. However, as a dealer, we also have an obligation to take care of our customers, and that's where they failed.
This issue can be remedied by talking to the service manager and/or general manager and having them write on the repair order "Modified vehicle. Calibrated radar and forward facing camera at owner's request. Toyota and dealer not responsible for the system not workings as designed due to unapproved modifications."
It's definitely best to keep cool and understand the dealers side too. In doing so, I think they will empathize with your issue as well and this should be a simple remedy: three hours of labor and a signature stating they are not liable should do the trick. If they still won't help, then you are best to find another dealer to patronize.