fast wearing brake pads - after 2 months

dear Sifus,

after 2 years of getting this new car, recently 3 months back i had just changed a new OEM set of Brake Discs and Brake Pads for front and rear due to excessive wearing.

one month ago, i had changed all 4 pieces of tyres with all balancing and allignment done.

now, yesterday i was at the official service centre, and was advised for my front brake pad balance is 85% while for my rear brake pad the balance is 65%.

both percentage was surprising to me considering the recent changes of all the above.

my driving style and distance are mainly city driving 80% and 20% city highway.... the only long distance i took during this period was a round trip from KL to Kuantan.

kindly advice on the situation.