Panasonic — Unprofessional behaviour

Address: New Delhi, Delhi, 110029

Hi
My 32 inch led tv was not working and an engineer from lajpath nagar service centre came and checked. He said that the motherboard is spoilt and made a call to find out the price from his centre. He then said it would cost me Rs 5, 050 to which i agreed. After two days I was again told it would cost me 7500.
Can they do that? I said i will not pay the new rate and told them to fix it for the amount they had quoted when they had come to my place . Till date I haven't heard from panasonic and my tv is still not working.