@sayedgulhassan
Haiiiiinnnnnnnnnnnnnnnnnn? Dont tell me yaar in Capital City of Pakistan, Post office branches are not interlinked with system of ETO yet.
I experienced such problems in Sindh in Late 90's but now at least NBP system as well as System of Civic Centre are interlinked and sync with each other. Furthermore, on Sindh Government website, updation of Tax also reflects(but here it takes time from 3 months to 6 months )
Whatever i can assume from your post that they have intentionally not interlinked both system to aid & hide their own Corruption.