Dell India — my laptop windows is getting crash after the replacement of motherboard and company not clamming my issue.

Address:

1/11b/4 kalibari lane , Jadavpur - 32

My laptop windows is getting crash after the replacement of motherboard and company says that its because of my pirated windows. But my windows was pirated from the starting when i have purchased my laptop and working fine before the replacement of motherboard that was changed by the company itself