Bosch Home India — coolant heating up issue

Address:

302, SRI SAI NIVRITHI, 3RD CROSS LEFT, ALFA GARDEN LAYOUT, AYYAPPA NAGAR, 560036

Hello Sir,
I went for coolant temperature issue, first time they change the coolant tank stating that it is leaking. After that also it is giving same warning. In second visit they change the radiator. After that also same warning was coming. Then I went third time they said need to change the thermostat valve and check and if problem not resolve then need to open the engine. Means even their service manager also not sure where is the problem. Like the new service person on trial basis keep on changing the parts one by one. Now I have big question mark on the skill and Expertise of bosch service man. car modal is Skoda Fabis 1.6L, no KA-53 Z 3709. I have visited to White field Raghvendra Bosch service center. I am just keep on loosing the money and time on service only and after almost one year problem has not been resolved.
Kindly intervene and give me proper solution to this problem.