POS transaction billed twice on credit card -HDFC

So, a Pos transaction made at a local supermarket recently has been debited twice on my hdfc card.. The card was swiped only once at the terminal and the transaction was successful at the first attempt.
Transaction was made on 1st jan. I happened to check the statement today and noticed 2 entries for the same transaction. Have called them up and raised a chargeback.
This was a newly upgraded card and this was the first time use with it on a POS (if that matters).
I wonder how could this happen when it was only swiped once.
 
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