Because I have posted earlier in this thread too:
I sent my CX550M for RMA, at first they said will you take CV550 or cashback I said I will take cashback. Later another guy (seemed to have no clue about earlier conversation) called and asked to which I said I will take higher version. So he offered RM550 which I accepted. Now my system is running on it fine.
Kaizen is indeed a strange setup where multiple arms seem to be operating independent of each other. Also Corsair mothership does not properly answer emails for support and doesn't have direct contact with their RMA resources here.