Bad servicing of my vehicle

I’ve been taking my car to Kia Silverlakes for yearly service since I bought the car and I must say I’ve been getting a good service. But now on the 25th of April 2025, my car was in a good condition no damages on the body and when I fetch the car, the fender liner was damaged. I took the car back and department manager “Elis” I think said she’s investigate. After her investigations, she said she is will to help me fix the car but we have to go 50/50 with the cost. By saying that it means you acknowledge that the fault is there’s. I mean why would you wanna meet me halfway if you know you’re not at fault? When I disagree with her teams and conditions she said she can’t help.