Airtel — paid for isd roaming - didn't get the service

Address:	Kolkata, West Bengal, 700038
Website:	airtel.in

I have paid inr 1199 to airtel to activate international roaming (For malayasia) in my number [protected] on[protected] after speaking to airtel store @ goalpark, kolkata. They failed to recharge as there was link failure.
They suggested me to recharge online and i a have done that on[protected] through my citi bank credit card, which was successful. To my surprise there was no network in my phone during my visit at malaysia from[protected] to[protected]. I got into trouble without a phone and was disconnected from all my contacts in india. I incurred loss in business.
Airtel customer care is refusing to refund the money i had paid for the service - which airtel failed to provide.