Help me get my money back

Hellopeter, My name is Shiburi Ntsako Pesta from the Company known as Shiburi Dietitian PTY LTD. In 2020, there’s a debit order named “Surepty” that started going off from my FNB account. It was an amount of R729 on a monthly basis. This debit order commenced soon after I bought a car (Ford Ranger Wildtrak) from Phalaborwa Ford. Unfortunately I forgot to reverse and block the debit order because I called my banker but the banker couldn’t assist due to the fact that the car was bought using the business account, therefore she couldn’t assist, she could’ve assisted if the car was bought using my own personal account. I forgot to go to the bank due to my busy schedule. The debit order went on deducting until I stopped it last year around November (if I’m not mistaken of the month). To my surprise, I tried to reach out to the company to find out as to what are they deducting the money for, with no luck. They kept transferring me from one person to the other with no answer to my question, the last person I spoke to hanged up on me. I then decided to stop the debit order and asked FNB bank to reverse all the debit orders from September 2020 until until November 2021. I received messages from the FNB app denoting that the debit orders were being reversed. However, I never received the money (I only received R729 back, which I’m assuming was just for 1 month (month of October). I then enquired with FNB several times up until I got the response that it’s impossible for them to reverse the debit orders since they are older than a month. I therefore decided to come to Hellopeter with a leap of faith that I may get helped. I need all my money back because I don’t know why the company was deducting my money and I don’t recall signing anything for the very same Policy that was deducting money from my account.