Adidas — Refund issues

I ordered a pair of sandals for 1250 rupees. As the size was not perfect I had to return my order. My Order no: AIN00305565. My payment mode was Cash on Delivery. But I received a mail from Adidas saying that they will refund my amount to the same bank from which the payment was made but my payment method was COD and there is no option mentioned on the website where I can enter my bank account details as well.
Please resolve my problem and initiate my refund.