Car mechanic sec 6 dwarka delhi

He guided me incorrectly and told me that coolant is finished and put 1 litre coolant where only 250 ml was required. He also checked the engine oil and told me that the oil is finished and we need to put oil but by god's grace I didn't let him do so else God knows what would hve happened. He also tried to make money by saying that the battery needs to be replaced.