Myntra.com — can't exchange product after redeeming insider points mistakenly magically just by single tap.

I got my puma men black hurdler idp smeaker shoes delivered yesterday. However, i mistakenly claimed my insider points and now i'm unable to exchange my shoes. I called the myntra customer care as well but they are unable to undo the changes made by me. There should be some sort of functionality to undo the changes made by the end user from backend/database. I know this because i'm a software developer.

I do not want my insider points, just let me exchange my product with other size. You can take all of my insider points.

My order id is:[protected]-4109601