Thanks DLAM
Actually, I got this Kit from a C-Hing who bought it from A-Main. So that's not my A-Main account. That's why I said earlier I don't know how to ask A-Main for replacement.
But, I opened the Kit myself while the SEAL sticker was still on the box uncut. so I am sure the KIT is brand new.
My post was deleted and told me to contact ...............
please contact your regional distributor. They will make contact with the service center in your region. You can find the details of the distributor in your region here: http://www.team-durango.com/where-to-buy.php