Staff is hard of hearing

Lawrence at the Engen Garage @ Devland is hard of hearing. I told Lawrence to throw R100 petrol in the car as that was all the cash I had on me, he decides to throw R200 petrol in the car! Then he turns around making me look like a **** and a *****! Why on earth would I say put R200 if knowing that I only have R100 on me. This is not my 1st experience at this garage with *********** staff! The last time I said R100 and the trainee threw R300 - not sure if they can understand English or not but drastic measures needs to be taken with the staff at that Garage. I want the Manager of the service station to give me a call and not the supervisor as the supervisor that was on site didn't even care what was happening. So can the MANAGER of Engen Devland give me a call.