Airtel — yet to receive my refund

I've recharged rs.597 to my airtel postpaid no on 23rd october. However it is not yet reflected in my account and also i've raised the case in airtel. But this case has been closed without my confirmation and amount is not yet refunded as well. Whenever i've asked my refund through customer care, there is no proper response from airtel customer care. Herewith i've attached rc receipt and case status for your reference.

Thanks
Rajendrakumar p