Those who are still getting no content found error.
Easy steps :
1) login ur Flipkart account in google chrome browser in mobile.
2) copy & open link
3) click on claim
4) Now important part : Continuously click on confirm button till it disappears. Keep trying.
Refresh the page, if it shows already claimed,Congo . go to supercoin zone , in claimed rewards, there u can see code.
5) Do recharge from flipkart app
By: via MY MAGIC TRICK