Unauthorized handling off my accounts

On the 7th September 2022, I called in the MFC call center requesting to load a debit order for my vehicle finance. I however explained to the consultant that I am aware that my account has been in arrears and that when they debit my account at the end of the month they can debit whatever is owing to bring the account up to date. This morning 09 September I had transferred money into my current account needing to pay for something else. When I eventually went into my account I saw an amount of R500 being debited by MFC. That is not authorized as I did not ignore my obligation to MFC when I called in 2 days ago and explained my situation. I would like this funds to be reversed into my account with immediate effect as I did not authorize this. It does not mean that I have a bank account with Nedbank they can debit whenever they feel like. I need this money back immediately. I look forward to a response as this is not a service you would expect from Nedbank.