Dell — Technical issue

Address:	Megacity mall Gurgaon
Website:	Na

My dell laptop was on no power mode suddenly after complaining 6 engineers visited and changed my laptops original parts with repaired ones .all parts like mother board, daughter board, Display etc but it couldn't help.
Bze they replaced mother board the laptop was asking for bitlocker key which I have never put.
They said they can't help me further and suggested to take this laptop to some service station and get it formatted.
Such a reputed company and this casual behavior of engineers.
All my original parts they have taken.
I'm facing lot of problems. Please help to get me a working laptop.
Thanks
Rajni Bhardwaj