Managers unprofessional conduct

I took my car for headlamp replacement at MAZDA CMH in Hatfield. I was called at 13:45 to come and fetch the car. When I got into the car the driver seat was damaged, I went back inside to notify them. The lady at reception came outside to check the damage and immediately called the Manager, Eugene when he came outside he clipped the damaged seatback with his hands and told me it is fixed.

I went back to the car and moved the seat to the back and front, the plastic cover was open again. i went back to reception and told the lady. the manager Eugene said he is going up to the workshop top look at the video to see what could have happened to my car seat he will tell me what happened. to my surprise he never returned to inform me what could have happened.

The mechanic came back to me to give me the car keys back, i tested the seat again, there was still a funny noise coming from the seat, which i explained to Eugene, he was defensive saying all cars do that. i told him my car never did that, mid you this car hasnt even clocked 40 000km, it is only at 37 000km.

He walked away from e whilst i was still talking to him so that we can reach an amicable solution.

i took my car and decided to report this because should any further damage occur to the seat he will exonerate his mechanics from damaging my car seat, plus his conduct was unprofessional.