dont buy Merc

Car has a clear clucking sound when slowing down. MB are of the opinion that,that is how a Merc drives. After owning 4 BMWs,my GLA45 AMG is my 1st Mercedes Benz and my last one. Zero support from MB SA. Even took the car for test drive with senior technician and he also said that the sound is not normal. MB refuses to work on my car due to them not being able to find the issue