Poor service FNB

I have been trying to reverse a debit order from a company I have no association with, the debit amount to R435 and I cannot reverse it, it says I should call the number at the back of my bank card, I did and the machine said the debit order service was not available, I called again and said that I have a problem with my account, I was transferred to an operator whose name I could not get, she logged in my call and put me on hold for more than 30 minutes. I need to reverse the debit order. In this time of COVID-19 I was relying on the cell phone/internet banking and avoid going out