[Resolved]  KLN Motors / Chevrolet Optra Lt — Reparing my car through Trial and Error method

Recently I left my car for service at KLN motors(Ekkattuthangal) for engine overheating issue. My car was taken care by Sajeesh (or Satish not sure about the name) and he analyzed the car and reported the issue is due to the thermostat valve which is malfunctioning. He also suggested to replace thermostat and V-belt and V-belt tension er, T-belt and T-belt tension er and other minor components for better performance of the car. So I agreed to replace all the components and the bill was around Rs 34000. He also told me that the engine over heating issue is fixed however they where not able to check the functionality of the A/C since there was no gas in the compressor and they had no facility to fill gas. He had also told me the auxiliary fan is almost worn out and needs to be replaced soon(may be after 5000 kms). After taking the car from them filled up the gas in the compressor after a week or two to check the functionality of the A/C and the engine started the over heat again. So when asked about the issue they said the fan should be the problem since it was already worn out. So once again left my car for service with them for fan replacement. This time they have changed the fan and the fuel float valve since it was also not working and the bill was around Rs 10000. Once the replacement is done they said they took it for test drive where the over heating issue was not there with A/C on. But they met with an accident unfortunately due to which the rear bumper of the car was damaged. They also said they will replace it for free since it was damaged during test drive by their driver. So the next day they took my car to Ambattur service station from Ekkattuthangal since the body workshop is only available at Ambattur facility. At that point also my car was not over heating they said and issue was completely fixed. Also due to this accident already the delivery of my car was delayed by a week. Now they brought back the car from the Ambattur service station to Ekkattuthangal and they tested the car for the final time and they said they purposely tried to increase the temperature of the car to check whether the issue repeats or not and at that point car once again over heated. So this time they checked the radiator and found that there is a crack on top of the radiator and they are asking me to pay for radiator replacement to get the issue fixed. I dont want to pay and get the radiator replaced since at first point they should have checked the radiator when I told them my car is overheating. Instead they tried to fix my car through Trial and Error method and already they have charged me Rs 45000 for part replacement and now once again they are asking around Rs 10000 for radiator replacement. If they would identified the issue with the car the expense would have not crossed max of Rs 30000. Because of their carelessness I have already paid Rs 15000 extra and now once again they are asking for Rs 10000 for radiator replacement. Is this a way an authorized dealer of the company will repair a car. When I asked them how this damage might have happened they say it is wear and tear issue caused due to overheat and they cant replace it for free. My point is if the overheating issue was completely fixed after the fan was replaced how the radiator got cracked in a normal condition. They say that the car was not overheating and the can run for 35 kms without coolant in the radiator and there is no chance of the radiator to get cracked since they drove only 13 kms(Ambattur - Ekkattuthangal) and they also dint find any crack or anything wrong with the radiator when we left the car for service. So I suspect that someone in Ambattur service station has changed my radiator from a car in which the radiator was cracked already. So please take necessary action to get the issue resolved soon without paying for the radiator replacement.