aliexpress follows the common practice of under invoicing, if u have paid USD 100 for an item the invoice would show only USD 20...
and if the item is counterfeit, then the price of legit maybe USD 2000 while knock off cost USD 100 on aliexpress..
Custom guys checked the value of legit item and used it as base value to determine duties instead of what is written on invoice or shipping document.
hence u got custom taxes calculated as per related HS code.
repacking and examination charges would be like just 500 max.
if u know exactly abt wat u have ordered, then u can argue with customs authorities that you have paid this much amount for the item and customs should not exceed that amount in any case,
also u can clarify to them if the item is replica so that they can correct the base value for calculation.
watever u do, please choose ur course of action wisely, its Ramadan btw.
in end i would request to order from aliexpress something which is essential and not available locally to save the foreign currency reserves.
thanks