Myntra.com — they denied to return the product

Address: Flat g2, shristhi tower,saraidhela,dhanbad, Dhanbad, Jharkhand, 826001

I had ordered one Raymond men blue slim fit shirt and it delivered on 31/12/2019. The size of shirt is small. When I want to refund or exchange the shirt unknowingly tap on claim points after that return and exchange not working and showing that this product can't be returned or exchanged. After that I call to customers care they also denied.

Thanking you