Adidas — Order Refund Not Received

I had placed an order worth Rs. 2999 on 14th October. I had to return it due to some size issues. The order was delivered to their warehouse on 26th October, Since then I have made multiple calls and written multiple emails but havent received a satisfactory response. The customer executives are'nt aware reason for the delay and claim that it will be processed in 48 hours everytime I call them.

Order ID : AIN01960097