Charged twice for the same transaction

We had a meal at Primi Piatti in the V&A Waterfront in Cape Town on 25/09/2021. The food and service was great - no complaints there. The meal's total incl. tip was R400.

However, when I checked my Bank statement a week or so later, I was shocked to see that I have been billed twice for this transaction: R400 was deducted from my account on 08 October by Primi Piatti, and then R400 was deducted again by Primi Piatti on 9 October.

I categorically dispute this double charge, as we were only at this establishment once on 25/09/2021, and I would like the merchant in PRIMI PIATTI (V&A Waterfront, Cape Town) to return the amount of R400 that was deducted a 2nd time for the same transaction.