Poor service! Terrible experience with Mercedes-Benz!

On arrival I waited 45 minutes to have assistance just to book the car in for service. When I was allocated a lady who would help me, she would not call back and you spend your day waiting or continually trying to call to speak to her. I resulted to go back into the branch as I saw that phoning was not a solution. She then fetched some quotes and discussed the financial aspect of them out in the client waiting area where other client sat. She called my mother back telling her the price of the total cost at an amount half of what was to be paid, but she eventually did correct that. She was supposed to organise a pick up service for when i collect the car. I waited until I cancelled, I used an Uber to go collect my car. She showed me they did this and this pointing on the paper and handed my key to me and left! Then a few days later some technician whom I had seen on site called to ask if I was happy with the car service and I told him “I don’t know I haven’t touched the car since. I am writing exams and if I would find a fault I cannot sort it out now”. He said he would call me back about the issue of the service I received and as I said to him “I doubt that” it is the following week and he or any other contact has been made. The receptionist rudely saying I call ALL the time. I had a BAD experience with Mercedes-Benz service! Your continual praise of excellence and service excellence couldn’t be further from the truth. The Mercedes-Benz experience is not one I would wish to experience again!