Refund of Rs. 510/- against Cancellation of my order by seventymm

I have ordered "Decor World Bed sheet Set - Pack of 3 (Pink, Red & Green)" on 06/03/2013 & make payment through my credit card. The order number is SMA0621566. i have not received my order at my place. I got call from the courier partner of seventymm regarding the courier for the same on 11/03/2013. They told me that they will delivered it on 11/03/2013. But that day I was not received. Next day that is on 12/03/2013 I called courier they told me that today it will be delivered but on that day the order was not received. Next day morning i again called to courier person regarding the same but now they told me different story that seventymm has told them to stop the delivery of order. Than I called to courier Mumbai office they told me that there was not proper address has been written. Than on 13/03/203 I got sms from seventymm that "we regret to inform that your order #SMA0621566 has been returned to us as undelivered despite several attempts. Hence order is cancelled from our end". But till date no communication regarding repayment of Rs. 510/- from seventymm. Even i am not able to connect with seventymm customer care any time.
On 20/03/2013 I got sms from seventymm that “Dear Customer, Refund of Rs. 500/- has been initiated against your order #SMA0621566. We will keep you updated on the status of your case”.

But no refund has come. Please do needful

Disputed Amount: 510