Buying Mercedes worst decisions ever

If I could give a rating lower how I wish. Never image buying a Mercedes Benz could traumatized me. My car has been sitting with a dealer since Easters. They don't know when I will get my car back. The part has been on back order since Easters. They blame covid than it was the Iran war. But I took my Jeep in for repairs got it back the same month. I am paying the car every month, but it is no use for me. Shame on Mercedes Benz so called premium car. If it was not that my car was under warranty I could have taken it long ago with your useless call centre where they can only respond on what is written on systems. The part is still on back order. I don't know if they are trained to respond like that to customers.