Sony India — Cheating with customer at service centre

Address:

Gwalior, Madhya Pradesh

My LCD of Sony is not working so I have launched the complain to customer care centre.They have assigned the Engineer of cool India of Gwalior.Engineer come's and check the LCD and after fully examining he said that the total cost of parts' and other charges will Rs 3500 to 4500 but we have to brought the LCD to his centre.now we have paid the fees of the concern engineer and went to centre with LCD by own sources and handed over the LCD to the Sony centre.After two days they says that your estimate will 8500.Now how it is possible that if the engineer says that total expenses will maximum 4500 after fully checking the LCD but after handed over the LCD the estimate of the expenses goes more than double.Now how will I pay the cost.IT is not only the cheating with customer but what they are doing with public god knows.who will give me justice.My LCD is still in the centre.I want justice and want to say that if the concern engineer has wrongly inform me the coasting then that person should pay the over cost and if the centre is doing some wrong with customer than the whole team should be punished.