cool event : arena rank->88 coupon

hudas22

GM of bleach

IGN: DarknessZ
server 229
arrancar
GUILD name: The 7th moon

i want to ask ..why i didnt receive 3 days ->88 coupon? it says in " COOL EVENT :under AREANA RANK --> (todays lucky rank ) --
  and I HAVE STAY/MAINTAIN ARENA RANK in  3 days just to OBTAIN/GAIN the 88 coupon, but i didnt receive 88 coupon in my email..why is that ?3 times.. please correct it ..if only i new i wont receive any i would already go to my original rank..i been calling some player to kill me just to rank down inorder to
get 88 coupon.. T_T