Asus — pci express 16 slot is not working

Address: Kozhikode, Kerala

My board is m2n68 amplus
its pci express slot is not working
My board have warranty.
So give that board to asus service center in calicut
after some days i recieve a msg.that was my borard was serviced succesfully.
I gone to the service center.they said pci slot cant be change.they bring the board.
What will i do? Pls replace my board
otherwise i will move lliegeli to consumer court.