Amazon India — book order

Address:

New Delhi, Delhi, 110062

I ordered the book `princess remembers`by gayatri devi as a `prime member. The initial total billing breakdown given to me was as follows - 1) book price=rs 356 2) minus 209 gift coupon 3) balance =209 & i was asked to pay a total of rs 147/only but after credit card detail billing came to rs 356/
Why this discrepency? I did not make the payment due to this wrong billing.
Please amend bill payment to the correct figure & i will then make the payment. D r chaturvedi