Tvs Motor Company — Engine seized tvs scooty streak

Dear sir/madam
I m from Dharwad Karnataka, purchased scooty streak in the month of july of 2013 At Jyoti motors Dharwad and leaving it for servicing timely at authorised dealers only. Till now the vehicles running is 6631 km
Now on 1st of june suddenly engine seized while moving.
Then I left it at Saroor showroom Dharwad, for repair. The mechanics after inspecting the vehicle say's that
Oil pump is blocked, piston crank, timing chain damaged
And charging above rs 8000 for repair.
I ran the vehicle smoothly all these days and left for service periodically at authorised servicing centres although I got problem in engine
So I m thinking that I got defective product.
So take this as my complaint and give me exemption on repair charges