Overcharged

On the 15 of of November we had the pleasure of dining at this establishment for a group of 25 colleagues. The service was ok. Paid the bill. Later to find they had overcharged us by a little over R500

Enquired with the restaurant only to be told they can't see any error from their side. It's really disappointing as we have receipts that show we were overcharged but to them it's a mystery.