Myntra.com — not able to exchange product due to insider points collected mistakenly

Address: 560102

I have ordered 2 jeans. I collected the insider points and after trying the jeans it is the bigger size so not able to exchange. Now myntra refuse to exchange the product. I don't want to return the product. They are not exchanging not even telling about refund. This could happen to anyone. I am not even asking for refund. If this is the situation they should give that option to collect insider points after return period is over.