Broken Promises and Frustration at Opel

I bought a car from Oztek Otomotiv on April 24th in Istanbul's Anatolian side, with a promise that the vehicle would arrive within a month. However, months have passed, and the car is nowhere to be seen. They assured me of price protection. Just two days ago, they called me with a shocking proposal: since my car hadn't arrived, they offered to provide a different color vehicle, but at a price over 165,000 TL. What happened to the price protection they guaranteed? When I questioned this, they claimed that Opel Turkey was to blame, while Opel shifted the blame back to the dealership. Clearly, they lack professionalism and reliability. It's a disgraceful situation. I won't rest until I've pursued my rights everywhere. My name is Abdurrahim H---, and I refuse to remain silent about this ordeal.