Crossbars Rubber brittle/cracked

I bought a used car on Saturday, according to Garagist from service and fresh checked. Now I am in my garage today and they looked at the car, a service was definitely not made, the battery is very weak and the rubber on both crossbars are torn (make at most 3.4 months). I called the garage and called these defects, he apparently knows nothing. Now I insist that he replaces them. He replaces the battery tomorrow and d I’ll show him the crossbar tomorrow with the photos. Now it’s questionable how to get through the vehicle inspection at the traffic office, my Garagist said. How do you find the crossbars? I insist that he replaces them. How much do you want it? I have 4 months warranty on the car. Sorry don’t live in DE and have no idea how you say the drivebars that are every 2 years.