DHL Express India — Asking for more 80% charges of courier amount to receiver

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I have send a courier through DHL and I have mention value of the courier and I have paid courier charges before sending, now when courier arrives india, ask receiver to pay another 80% of the value.
It really surprises me, They ask to the receiver 16000 INR which is 80 percent value of the product. for what and why should the receiver pay the money to DHL, give me a reason.