Myntra.com — can not exchange product in myntra after redeeming insider points

I got my bodycare innerwears delivered day before yesterday however, i mistakenly claimed my insider points and now i am unable to exchange my shoes. I called the myntra customer care as well but they are unable to undo the changes made by me from backend. There should be some sort of functionality to undo the changes made by the end user.

I do not want my insider points, just want my replacement. If required you can take all of my insider points.

My order id reference no is[protected]-8838403