I've never heard of a car called "Amonti".

Do you perhaps have a Kia Amanti instead?

30 k km is very fast wear, but not entirely unheard of. I have always been very easy on brakes, but my '94 Golf went through a complete set of rotors and pads every 40k like clockwork.
BTW, if the rear brakes went that quickly, but the fronts were OK, I would suspect that the parking brake cable was not releasing properly.