Ali Express — seller asking to pay transportation charges which is half the price of product

Website:

aliexpress.com

My concern is regarding the dupad i have ordered on 15/06/2017. I ordered because it is written delivery is free, i was informed that the product will be delivered within the 3 days of cash payment. I made payment on the same day. I paid $255.99. However, the product was not delivered to me for nearly two weeks. I had to contact the seller on a regular basis, but in vain they didn't reply. After a long period of time, they finally send the product. I was informed that there won't be any additional delivery cost for this product. But when it was about to dispatch at my local post i was informed that i have a customs charge of rs7979. Which is almost half the price of the product? I was not informed about this.
I opened a dispute on july 23 for the refund. As a result of long dispute and negotiation seller agreed to share the customs duty. He informed me that he will share $95 of total customs charge $125. He agreed on the proposal that i shall pay $30 to the seller so that he will make the payment of tax from his end. Even the dhl agreed on that. But now the seller stepped back from that.
He is not willing to keep his word. He is not paying tax on his end as agreed. I am wasting my time and health on this issue for nearly 3 months now. I believed in aliexpress but i was getting cheated as the disputed result says i have to pay transportation charges.
Now i have neither mobile nor my hard earned money of 16500inr.
Hope aliexpress will not let their customers suffer. Please, i need a fair solution here as soon as possible.
I can agree on following quotes :
1) full refund of $255/16500inr: i dont want the product, i want my money i spend for this product back.
2) i can share $30 to the seller, he need to share $95 and settle bill from his end as agreed.