Mercedes Durban service deteriorated

Service getting pathetic at this dealership. Booked a service on 27th of February and asked agent EB to detect and sort the oil leak I observed. Car was left at 7.15am and waited entire day with no courtesy call from them. At 3.30 I phoned and was told car is in wash bay. Eventually only got my car at 5.20pm. This was the longest I ever waited with no explanation. They definitely never bothered with the oil leak as the agent only told me there was nothing detected when I enquired. The leak is still there and today this EB sent me an sms about a spark plug having arrived for my car. He never mention this when he released my car. This agent is either highly confused or had mixed up the vehicles. My enquiries about the plug has since been unanswered.