Nykaa.com — refund/return issue

Hi,
I have purchased biotique products but wrong lakme products was delivered to me. My order no is[protected] . From nykaa site as well as from Nykaa app I have tried to apply for return / refund by attaching invoice and picture of products which I have received but unable to submit it because it's giving me error like request entity too long. It's really very disappointing, please help me to resolve this issue.