Fedex — Customs tax

I imported my personal like cloths and more belongings worth 300gbp from Uk to India through FedEx from a mediator called parcel hero. I paid shipment charges quoted in parcel hero website. Now I got mail from FedEx stating that I need to pay custom taxes worth 25, 000 Rs. I can't pay this tax for 28kg personal belongings. I want to cancel the shipment and refund my money back or deliver the shipment with no extra cost. As I paid for the shipment I don't want to pay more. When I got the quote, they never mentioned anything like this and now they are asking for taxed and all. tracking number is[protected]