How to deal with incorrect disclosure in advertisements before collection?

Hello all, I hope I’m right here. I placed the “binding order” for an annual car in a car dealership a few days ago. Now I went through the advertisement again and I noticed a discrepancy. At the top of the overview of the equipment is large “navigation system”, further below however “SYNC3 light”, which is according to the price list of the manufacturer without Navi. I suspect by now very strong that the car has no Navi. In the contract itself is even kei Unfortunately, I tried another vehicle in detail and only drove it around the block and looked at it once, without checking every single feature, whether it really is there. The Navi was not the most important point now, but an argument, why I took this one in particular and not another car. On the Internet I could already find that the ads, even if nothing is in the purchase contract, How would you proceed, what possibilities do I have? Possible goal would be either a discount, the change of the vehicle at the same car dealership or even the cancellation and the purchase elsewhere (or improvement, which probably is not possible?). Thank you already!