Philips India — Brand new led having faults not replacing

Address:

Karnal, Haryana, 132001

My parents gave philips led model no: 40pfl5059/v7 aza, in my wedding which held in oct 2016, bought it from sargam electronics karnal, haryana.
We opened it in april and it was opened by official philips person to setup it. It worked only half hour and then it stopped. I called the customer care they came and said a part need to get replaced. They replaced the part, it started working infront of them and again stopped after 20 mins. Again the same process they changed something, it worked for few mins then stopped. Now again they are saying they will change the plate if it works properly then its fine else they will replace. I dont understand a brand new led doesnt work 3 times after the changes and they are not replacing it.
This is so frustating its like buying a brand new item which is second hand. I request the officials to take this complaint as priority because may be it works after changing the plate, but who knows it stops working after 2-3 months then i will be out of guarantee period and moreover its about honour of my parents because its my wedding gift.