Negligence and Bad service at BMW Bedfordview

So i took my car in at BMW bedfordview for diagnoses on the drivetrain issue. When i fetched the car started overheating, when i then checked the bonnet the water bottle cap was missing. I sent and email to Mr Ndlovu he basically told me wait until 10am and i specified that i need the cap ASAP as i have booked the car elsewhere. He then agree that they will fetch the car to check if there was no further damage due to thier negligence. He then sends a technician to fill in water (total disrespect).

I am very upset because not only did he lie but he also never took accountability and continuously undermined and disrespected me.