Airtel — Didn't get the refund

Address:

Uttar Pradesh

I want to recharge my mobile no. [protected] for 1 GB 3G plan so I go to http://m.airtel.in to recharge it. I try 3 times but got a reply that your transaction has been failed and if amount is deducted from your bank will be refunded within 4 days. I done those recharges on 14/12/2012 and got refund of only one transaction on 17/12/2012. Those recharges are of Rs. 250 each. So, out of Rs. 750, I only got refunded of Rs. 250.

I need my Rs.500 also refunded to me.