airmatic drives tough after a repair of rear suspension cause of accident?

What is your question?

Mercedes benz fixed an accident from rear tire whole rear was change cost of 14k after that car does not go over the bumps like it's absorbing instead there is a sports car like hit to vehicles cabin I took it back to Mercedes and they said it's normal but I know it didn't drive like this before and I don't have the sport comfort settings I m stuck I hate My car now don't Kno what to ask them to do help please