Urgent request for refund

I recently paid Mangaung Metropolitan Municipality . I used the Capitec Bank app to make a payment. The amount paid was more than what I was prepared to pay. The app gave me problems and ended paying the full amount. I visited the Loch Logan Capitec bank for assistance to reverse the payment and the branch manager told me that there is nothing he can do to help to reverse the payment. I request Pay@ to refund the amount paid to Mangaung Municipality to my account as it is not yet reflected to the records of Mangaung Municipality. The amount that I planned to pay was R1000 and the amount debited from my bank account was R14,374-27. I need the funds urgently to pay outstanding debit orders and other commitments. The transaction took place on the 16 November 2023 at around 08h30. My pay@ reference number is 1133010088995. The land line for pay@ is not working and their email doesn't not have auto reply. The needs to be adjusted so that you can only add the amount to be paid not showing the whole balance when you pay on the app.