Sr50 r brand new stage6 260mm oversized disc from sip scooter is buckled

hi everyone

ordered a stage6 oversized breakdisc from sip scooter, after i fit the disc, went out for a spin, ,the handle bar shakes badly when using break,and make a loud noise, disc is buckled, cannot be used.

here is the link shows what i am talking,

http://www.youtube.com/watch?v=QdyZr5_hz-M

i want a refund or a replacement