IPhone X Original Unofficial Used Products Uk Or Usa Version Available

first of all they are asking for advance delivery charge which is 350 taka. i am ok with it. now they are asking  for 4200 taka for IMEI registration. they told me that i there will be no advance charge before i receive the product. now they are asking for it. i think this is scamming and fraud because some of my friends are scammed like this why from the seller. the delivery status showed delivered even though i haven’t received the product and the delivery address and number is also wrong.