Reserve Bank Of India [RBI] — Money debited from SBT account

Address:

685586

36000 rupees has been debited from my account on 10 December 2016 in a failed PoS transaction. The money was debited in three swipes. The error code that was displayed in the PoS machine was '51 declined'. Only 24k rupees has been refunded. It's taking too long for the refund of the remaining amount (12k). I lodged a complaint at our bank branch on 13/12/16. But even after 30 days the debited money was not refunded fully.