Bought my CLA 45 about a month ago and just noticed that only two of the three buttons on the side of the performance seats actually move. The third one is static. Specifically, I am referring to the button for functions 5 and 6 as per the owner's manual. When I went to the dealer I was informed that it was a "dummy" or extra button with no functionality in this AMG model. When I showed them the owner's manual they said that the information was probably copied from another AMG model car with performance seats that actually have the three-button system. So basically the question is whether MB put another models' three-button casing on the CLA 45 rather than a casing for a two-button system or am I getting the runaround from the dealer?