@thekhanlala, Thank you brother for the name of the pads as well as the advice, but my father got them changed yesterday with the Genuine ones, which cost around 4000 as said by CutePoison. The reason I post this thread was to confirm whether the mechanic charged the right amount or not. But yes you are right as the new brakes are hard, as compared to the previous ones. Furthermore, the mechanic also said that these pads will last longer, like an year or more.
I think that this is the similar case to that of the General tires, which last long but ride hard to some extent.
I observed that generally aftermarket parts are pretty good as compared to the originals, especially for Mehran, but does not last longer than the originals.
@aqs29, Thank you brother, saved your upload immediately for future concern.
@CutePoison, Thank you brother, that's exactly what I wanted to know :).