FND Debit order dispute - Furious!!!

I am beyond irritated with FNB, I have a debit order that went off my account of R3 150.60 on the 25th which was yesterday, I called yesterday to have it reversed and was told they cannot reverse it the same day it went off I need to call today 26/01/2021 I call today since 08:00 IN THEMORNING and I was on hold for almost 45 minutes when the 1st consultant could not hear me, then they had to put me through to the 3rd consultant because their lines are not working properly. That is a huge amount to get debited of my account for something that I did not authorize or have no knowledge of now when I get through to a Dumisani he tells me it is blocked he cannot assist me to reverse it he needs to put me through to the easy accounts department for them to reverse it for me. I held on for almost an hour from my work phone and no answer, I am beyond irritated and choose to leave this God forsaken bank, the service is ridiculous. I am a single mum and left with almost nothing in my account after that debit order went off, FNB tell me how will I feed my kids this month??????