Large wrong amount deducted from account

Wesbank has deducted R23 000 from my account instead of R8000. I’m not in arrears or anything like that . This is such a huge inconvenience on my side as I have other debit orders to pay this isn’t my fault I called the bank they saying they not sure how it happened and that the money can only be reversed after 7 days and that the amount is not yet reflecting on they side. There public holidays coming up which means there will be more delays. I can’t reverse the payment from my side such a huge inconvenience not sure why they deducted so much money