Worst service experience

On 2 May 2023,I took my car for the sunroof to be checked. The receptionist told me to wait for the technician. I waited for more than 40 minutes, until I gave up and leave. Little did I know that on Saturday the 6th May 2023, my car will have a faulty spark plug a d be taken to the same dealership. Guess what, my car, a 2023 model C Class with less than 12000 kilometers is still idling at Mercurius Tzaneen due to faulty spark plug today on 12 May 2023. The dealership does not know when they will receive the spark plug. I'm very disappointed 😞 by this worst service experience. I'll never take my car there for service, not even to buy from them.