I shall go down to Nikon service centre to check the cost. If they really can't fix it, then I'll just leave it alone as most of you have adviced
Most of you would probably think it's really weird that I'm doing this but the scratches really bother me, since my camera is perfectly scratchless I dont want to have a lens with scratches all over the label.
Thanks for your comments.
it may be cheaper just to buy a brand new lens.