amazon join prme get 20% back

http://www.amazon.in/b%3Fnode=13827384031
Offer period : June 14th, 2017 – June 28th, 2017
Join a one-year Prime membership between 14th June and 28th June and load Rs. 500 or more to your Amazon Pay balance to get 20% cashback (up to Rs. 300) as Amazon Pay balance (“Offer”) in the Offer Period.
The Offer is applicable only for customers who start a One-year Prime membership in the offer duration (14th June to 28th June). If you joined one-year Prime membership before 14th June 2017, then you are not eligible for the offer.
Members currently in a free trial will be eligible for the offer if their trial ends between 14th and 28th June and they sign up for a one-year membership on or before 28th June. Members who continue to be in a free trial past 28th June will not be eligible for this offer.
The cashback amount is limited to maximum amount of Rs.300 per customer.- The customer will receive the cashback amount in the form of Amazon Pay balance, which will be credited to their account