Lease and vat

I working in Mumbai (Maharashtra) with IGATE Global solution wherein I have got car on lease. While purchasing ,Lessor (A Finance company) financed entire amount including VAT.

While calculating rentals they have calculated on total amount (Car cost + VAT+ Registration etc..).   I am paying rentals to them as an EMI and also paying separate VAT on rentals however it has been calculated in rentals.

 Now I am planning to foreclose, I have got statement from the finance company where in they are again charging VAT on remaining principal.

Kindly suggest if it is correct or please provide the right solution of it.