BMW MENLYN WORST SERVICE EVER

I took in my car for service a week ago at BMW MENLYN worst service ever, I got to the dealership at 6:30 and I was the 1st client to get there. A gentleman approached me and took my car keys he advised that a service agent will contact me when he arrives at 8 o’clock I left him with the car key and took an Uber back home, I waited for the dealer to call me no one did until I decided to contact them around 12 o’clock to my surprise after contacting the dealership I was advised that they haven’t started with my car I will be contacted as soon as they start I then waited for about 2 hours and called back the dealership around 2 o’clock I was told they haven’t started with my car I got very furious and I was told they are going to start serving the car at 3 o’clock which I didn’t understand because I was the 1st client to drop of the car. Today as I am driving my car it shows a message on the screen that the coolant is very low I need to top it up ( This means my coolant was not checked at the dealership and I am starting to wonder if the car was even serviced)The car is now coming some white smoke from the exhaust which I don’t understand what is going on , I then dialed the mobile care number for assistance and I was told I need to refill the car with tap water which I did, I advised the service agent that the is white smoke coming from the exhaust and I was told that I must call tomorrow for them to tow my car like really I am stuck and someone tells you call tomorrow...I AM SO FRUSTRATED