State Bank Of India [SBI] — Refund initiated bye bewkoof.com but not credited to my bank account

I have ordered two t-shirt on bewkoof.com of each rupees 279 total rupees 538 but due to size issue i returned both of them on 8th april but till now i haven't received any refund amount. I mailed to bewkoof.com and ask them for my refund they told me that your refund already refunded.then i call to sbi customer care but they didn't help me. order details and mail from bewkoof.com both photos attached here. At last i want back my rupees 538 refund.
Thank you!