Myntra.com — refund on cancelled order

I have placed order on 15th october and cancelled instantly still i have been charged for the order when i contacted myntra they said refund has been initiated it's been 7 days i didn't received refund of it and myntra is not helping at all it's a fraud and every person is copy pasting the same email to me and no one try to resolve this issue and it's unacceptable if customer is trusting you then this should not be the result of it... It's a fraud and if its going continuously very soon myntra will loose their business in india and they will responsible for it