Poor service/feedback at Mercedez PE

I booked my car for the 04th of Jan for a service and repairs as it was making a noise and the car was delivered in the morning. I had to call them around 14:00 to hear the progress. Lindie(Service Consultant) said she would come back to me, around 15:00 I had to call again to hear that they will not service the car but the sound is a faulty petrol tank. She promised to get me the quote first thing in the morning. I had to call her again around 10:00 to check the quote as she had not called as promised. Only after 12:00 on Tuesday after calling her again she gave me the quotation and she promised that the car will be ready for collection on Friday as they will place an order for the part. On Friday around 10:00 I called to find out when they will be picking me up, after no feedback from Lindie I called again about an hour later and she said the car will be ready on Monday. I told Lindie about my dissatisfaction on the feedback and the poor service and asked to her speak to her manager which was not around and she said she would pass the message. I then drove to Merc only to find out that they are not working on the car Lindie had ****. Story incomplete due to space