DHL Express India — Excess custom duty charges demanded

I have bought headphones from a company called Meze Audio in Romania. They used DHL to ship the product to me.

The product costs Rs. 18700 and I paid 3000 for "Express Shipping." After a delay of 4 days at Bangalore(reason given: "held by Bangalore customs"), I received a message from them asking me to pay an additional amount of Rs. 9134
Message from DHL:
"Payment of import duty/tax is required for DHL Express [protected] from MEZE AUDIO S.R.L." with a link for payment. Which took me to a receipt for the aforementioned amount. Here they have put random charges like "CS- bonded storage charge" and "Deferment risk" to the receipt generated by them.

Please assist to get my package without making me pay the false charges claimed by DHL. These charges are almost 50% of the package amount.

AWB - [protected]