Flipkart — Refund not credited ICICI/ Flipkart

My order number is OD[protected]. It was canceled by flipkart as the delivery service was not able to pick it up. I received a message saying that the refund has been credited on e November and that I will receive it by 4 November. It is 11 November as I am writing this and I have still not received the refund. I contacted the customer care and they are requesting for my bank account statement. But I am hesitant about it as it contains my personal financial information. The customer care today sent me an email saying they are closing this case. Please help.