Antara 7 or 9 speakers

Can anyone help me? I ordered an Opel Antara 2.0 CDTI , Cosmo, black (Cosmo package DVD 100 Navi) at the beginning of October 2007. The vehicle was delivered at the beginning of January 2008. I immediately noticed that only 7 loudspeakers were installed in the vehicle. In the rear door cover, where my opinion would have to sit after the tweeters, is only an atrappe without breakthrough and loudspeaker. I immediately criticized this in the car dealership and asked for information. There was only shrugging shoulder, I left a about 4 weeks later I got an appointment with a sales representative of Opel. He could not give me any information either, but promised to clarify it internally and to inform me. After about 1 week I asked in the car dealership and got the following answer. There are no 9 loudspeakers at the Opel Antara, it was once in the planning (that is why it is in every description), but was never implemented. Since I put on 9 loudspeakers worth and it is not possible to upgrade them, b If so, how can I prove to the dealership that I did not get what I ordered? I had the suspicion of having got a storage car and had the production day reported by the Opel employee (24/10/2007). For this reason, exclude my guess. Picture 1 front door, breakthrough f. speaker picture 2 rear door, without breakthrough M. f. G. steffcor