Air Bag Light On problems of the 2008 Lexus IS350

Takata recall. After letting the Lexus dealership do the recall on my airbags, I received a airbag light shortly after and let them know I didn't have the issue until after they serviced the airbag. The issue is stated that they made the harness too short in my year car and Lexus is not taking responsibility for their error which is putting my life and my child's life in danger if we were to get in a accident with my car. The airbags are disabled due to this faulty harness. When contacting corporate they only offered to help with $500 of the cost while the dealership wants $3500 to fix. This is absolutely ridiculous. Why should I have to pay for a issue that Lexus knows was there mistake. This is a major safety concern and should be addressed immediately!.