as @ifadey said, most of the filters in the market are fake. plus their packing is also fake.
I have used the AC filter both local one and the one from dealership. the one with the dealership lasts longer than the market cheap one as the ac filter from dealer ship costs Rs. 4300/- and it goes for more than 10k kms.
as for the airfilter, the original from dealership is way better than the market ones plus the market ppl dont pay taxes on the sales of these cheap filters manufactured locally.
the damage to the cooling coil and the engine internals effects slowly which we dont notice by using cheap filters but in the end it will damage the pockets well.