Adidas — Refund Not Received From One Month

I Orderd Item 1720 it was COD item and due to size issue i returned the product, product successfully picked and received adidas, as it was COD item so i shared my bank details to them on 9Aug and till now i have not received my refund, Every week i called customer care and they responded like wait for end of the week and it is happening from last three week. Till now i have mot received my refund. AIN01179191 this is my order ID