Myntra.com — I have asked for replacement but they have cancelled my order and taken return

Address: 636005

I have ordered crocodile shirt blue colour shirt size 42 but it didnt fit me so i made replacement for 40 shirt the 40size shirt came for replacement but the ekart delivery person asked for style code that it is not matching while scanning so i have made a complaint that while scanning the order it is not matching nu to the customer care person he took a complaint past 1week fully they have made a research and have cancelled my replacement/exchange order and made it as return now the. Product bcame not available when seeing in the myntra website. What the hell is this man myntra # of you worst delivery agents no correct response