Timtara.com — non shipment/ non refund even after 11 weeks of payment

I have ordered Samsung tab 2 on 17.8.2012 with order no.[protected]see the attachment). After one month as the product not been shipped I have applied for cancellation and refund the amount on 18.09.12. But the amount has not been refunded yet. even not getting any response from them. In the Site always showing awaiting shipment. I have called the customer care executive many times . they are saying and repeating " your refund will be done after 24 working hours". it has been many 24 working hours over. but our product is not reached yet or refunded. I have already send email to their chief customer officer many times regarding this. but no response .Now elapsed about 11 weeks after my order and 7 weeks after my request for refund and they are still cheating me