Koovs.com / Marble E-Retail — About my refund

I have ordered a shirt and slides . The shirt I ordered was too big for me as it was M size so I made an exchange request for s size . The delivery partner had taken the product then it's been nearly 20 days after then they told that product has been reached out facility and initiating exchange . Iam fed up with their customer care and I cancelled the exchange request.then there is no update about any refund they simply told your order was cancelled . I want a refund regarding the cancelled product. I mailed them so many times regarding this but they are not responding to my mails.please resolve my issue . My exchange order I'd is K308023.