The truth of the business transaction

This morning I went to the Chin-Marie auto shop to have my van check for radiator leaks. The mechanics immediately check for leaks and they recommend it for overhauling. I asked the in charge person their regarding the cost of the repair. The in charge attendant said that it cost more or less 650 pesos. I agreed with the price but after a couple of minutes, the in charge person said that the radiator repair man can't determine the cost of the repair because the owner was not present to examine the repair. the Chin-Marie shop asked me if the repair man can continue to repair even not knowing the price as long as I will pay the price and I said "Let's wait for the owner so that I will know the price cost. At exactly 1 in the afternoon the owner of the radiator repair shop arrived and the Chin-Marie officer in charge called Bong who was the owner of the radiator shop. They communicate each other through phone and after their conversation, Chin-Marie attendant told me that the cost of the repair is 1350 pesos and I was terribly shock because the labor cost was so big compared to other radiator specialist. I said to her that please tell him that I am going to withdraw my unit because I am thinking already that they were overcharging. After that, I went to the radiator shop to get my unit and go straight to other radiator specialist in Bangkal area that offers the same services. I asked the labor cost of the radiator repair and I was only charged 400 pesos. So It is really clear that they are overcharging a big amount for a small service cost. It is good to do business and to gain profit but in a good way not to the extent that you are already overcharging.