Was i not amply clear first time ?
Check in your Amazon order for the duty paid . Aramex didnt pay the duty .
Go to Amazon.com , Open orders from the account tab , in that open your headphone order and view invoice
Maybe I didn't make myself clear. I know the customs duty charged by Amazon at the time of paying itself and it is there in the invoice as well. In-case the customs duty paid (by the designated carrier) is less than charged value Amazon is supposed to refund it. This info has to be supplied by the carrier to Amazon. It is listed in their international shipping policy.