Myntra.com — fund not received from 3/7/18

My order no. 108151652063897234301
I only accepted one item of mast and harbour black jeans of Rs. 598.
But I recieved refund of only two jeans of roadster of Rs. 471.45.
I don't recieve 691.95 refund in my bank account from 3/7/18 till now.
I spoke to many customer care services providers and gave my bank details at least 15-20 times by emails and you gave me same reason after 3-4 days that my bank details are incorrect.
How you can give such a silly reason for so many times because my bank details are same and absolutely correct?
Please give my money back.