You did the right thing by posting on the forum instead of
finding a contact from ns.sg to call, email, mail, basically to
contact mindef directly.
by posting on the forum, the forumers can use their super
ability to find out what happened. For example, time traveling to
see whether you clicked defer. Or hacking through the mindef site
to find out your NS status. Or look into the future to get your
exact enlistment date.
By my powers of guessimate, you are not granted deferment and
are doomed. end of story.