Stx liablity on ihc charges in case of cip contract

WE IMPORTED A CONSIGNMENT ON CIP BASIS WHEREIN THE PRICE INCLUDED THE INLAND HAULAGE CHARGES FROM DISCHARGE SEA PORT TO THE DESTINATION DRY PORT. THE SHIPPING LINE HAS BILLED US THE SERVICE TAX ON THE IHC CHARGES WHICH WE OBJECT TO PAY AS WE ARE NOT A PARTY TO THE TRANSPORTATION CONTRACT BETWEEN THE SHIPPER AND THE SHIPPING LINE. THUS PLEASE ADVISE IF WE ARE LIABLE TO PAY THE SERVICE TAX OR NOT AND QUOTE THE RELEVANT NOTIFICATION THANKS