Disappointing quality for a Luxury Vehicle

In the past two months both our fold down seat clasp have broken. We have a coupe therefore the clasp should be strong enough for constant use. With no negligence on our part the clasp snapped and we see it is made of plastic not metal as we presumed. Secondly our center consul has stripped and will no longer open. This happened to our previous Mercedes too. This is not the quality we expect of a luxury vehicle. We look after our vehicles and we are very disappointed. We approached Century City Mercedes as the vehicle is still under warranty. We were told that cosmetic breakages were not covered under the warranty. The damage is not due to wear and tear but bad quality.