Nikon India — made scratches while cleaning fungus

Address:

Kolkata, West Bengal

sir, i have a Nikon d7000 camera body and a Nikon 35mm 1.8 G lens, 1month old. The camera was facing with auto focus problem. so, I have given the camera and lens both to the Nikon authorizes service center (as mentioned in Nikon’s official website-"Capital Electronics"). When I gave the camera that was 100% perfect condition, without any fungus (and i have the document proof). But when i get back the camera that was affected with fungus. After a little argue they cleaned the fungus, but the lens was affected by the little scratches. When i told them that, they told me that was present from the time of receiving.. Now i don't know what to do and where to complain..