Unauthorised Transaction from my account for a payment i made 2 months ago

I received a notification from my bank that a transaction had gone off my account for the amount of R1500 to Tread and Miller. I queried with multiple consultants regarding this transaction and it appears that this transaction was for the 25th of February 2020. On the 25th of February 2020, i went to Tread and Miller at Mall of Africa to pay an Account. I swiped my card, entered my pin. The transaction went through but due to their faulty systems, this payment was reversed shortly after. I then had to walk all the way back to tread and miller to make this payment again. I advised them of the situation and made payment again. I swiped my card, entered my pin and just like the first trasaction, was approved. I then waited to ensure that the payment went through and there was no reversal notification.

I have checked the account that i paid through Tread and Miller and have found a duplicate payment entry for February 2020. This is unacceptable that you can just deduct money from my account without my consent, consulting me, or my authorisation 2 months later.

Please can you rectify this issue as a matter of urgency as i have a budget to meet and it does not include unauthorised payments from my account especially during this lock down that we are currently facing.