Nedbank's unauthorised debit / shocking service

We had a business speed point machine from Nedbank. The business closed down end of January 2024 and Nedbank was notified to collect the speed point machine, which they did on 06 February 2024. At the end of February we were debit 600.30 being the rental for the machine. I notified Nedbank Merchants Department that the fees should be reversed because the speed point machine had been collected by one of their employees. I received an acknowledgement , but the fees were not reversed yet and all my follow up mails have been answered . One cannot trust the bank for our financial transactions, who can we trust? Definitely not Nedbank.