Amen, brother!
My advice to you is; don't pay beyond 3-5% of the price (There's only 3% custom duty on computer hardware) and if they show you a receipt like this; then it means they're scamming you BIG TIME!
Here, a man was charged 815 rupees in the name of so called 'custom duty' for importing a product worth rupees 1,400.
Let me tell you something; there are no 'repacking charges', 'postage dues', 'postal fee', 'sales tax' and 'refugee tax' on a shipment imported via AliExpress so don't fall for this utter bullsh!t, alright?
And in case you're wondering about that peculiar 'refugee tax'; this tax is reserved for goods imported for Afghan Refugees and I can assure you that the man who ordered this stuff was a registered Pakistani Citizen with a valid CNIC so...
SCAMMING AT ITS FINEST!!!
And don't forget to take the print out of the FBR's import tariff with you.
Best of luck!