neglegence caused

I took my car to the service center in Centurion asking only for a quotation for the brakes. I was told they do a full assessment and it would cost me R250.00. two hours later, I had not received a quote and was told they couldn't tell me how much longer it would be. I asked them to stop and I would collect my car. when I proceeded to drive home my car started over heating, upon checking, I discovered the water had been drained. Samantha at the Centurion branch confirmed they had drained the water to check the colour. I asked my car be checked for damage done due to their negligence. I was told I could take my car to the nearest branch. except no other branch is willing to inspect my car. Vanessa at head office is now claiming they did not drain the water and refuse to acknowledge any misconduct. so whatever damage caused is now my responsibility, cost me R250.00, and my brakes was not done. I feel this is a terrible way to do business, and treat a woman driving long distances alone.