U mean MDT different from receipt la.
I thought MDT different from meter cos did not add u all the
surcharges.
Once got a HK lady who gave me 2 $5 notes after I press the
meter and said "keep the change" When I look at the MDT, it read as
$15. Cos she did not add up the surcharges and the booking
fees.
Anyway, I always collect based on the MDT, never tried looking
at receipt before.
Yours seems to be a serious software problem, better get
them to check.