any maxis postpaid here? on mobile internet particularly?

I just switch from DiGi -> Maxis last week
on 8/6 to be exact

right after I was switch, I subscribed the 3gb plan @ RM68.

ok then Maxis SMS me and tell me my pro-rated billing date will on 28/6
I dont get full 3gb data plan but only around 2.5-2.7gb until 28/6.

right after I notified that, I set my 3G watchdog limit
2.5gb / month, expired on 28/6. (where on 29/6,I will reset to 3gb for July)

heres the case
as at today, I try check on *136*9#

at status

it stated

"you've 928.52mb balance as of 15/6 (today) at 1230pm"

the problem is, when I check with my 3G watchdog

I only used up to 985mb / 2.5gb.

so is the word used by Maxis wrong? or I really only left 928.52mb, that is crazy because its only 1 week & I already used up to 1.6gb +++?!??

This never happen when I use DiGi :/

walk in / email them?

that is real strange anyway :/

I've been use DiGi for 2 years (under contract)
my monthly quota hardly use half of 3gb also
now its like left 800mb ++ only