Porous rubber seal on the panoramic roof

Hello to each other, seen a T-Roc at the dealer, found super beautiful, ordered (late) and received since that much fun with him. However, after 2 months at the rubber seal of the panoramic roof holes and cracks found, meanwhile the complete rubber is porous. The dealer also took photos immediately and requested the guarantee. Now the shock for me, he was rejected. Since the trained experts at VW could recognize it on the photos that it was here r has to deal with external damage, such as birds or and high pressure cleaners. So far I had not washed my car with the high pressure cleaner and washing system should definitely withstand the seal, besides, the car is in the garage and only during the day on the company parking lot, there would have to have other employees this problem. Long talk short sense, does any of you have similar problems? So far no water enters the interior, but the s will only be a matter of time. Although the net of the wind catch is already molded. Who can give me tips on how to proceed, expert and lawyer etc. ? I feel like an innocent defendant. LG