Khadim India Ltd — Billed twice for Rs. 671.

Address:	Khadim India Ltd, Vijaya nagar Khadims, Preeti Arcade water tank bus stop, Vijayanagar 2nd stage, Mysore. 570017, Karnataka.
Website:	www.khadims.com

I have been billed twice for my purchase of Rs. 671. When I checked my account balance immediately, I told the shop seller. He informs me that, I have to mail to the company to get my excess amount billed. This is going to be a huge scam.
To get the excess amount billed which was a sales man mistake, they are asking me to mail and get the refund. I am not able to get the excess amount refund.

Kindly help.
Thanks
Ghouse Peer