Unauthorised Debit

I currently have an arrangement with African bank to deduct R300 of my account by debit order as my finances have been cut due to Covid 19. Today I checked my bank account as I have barely any money left in my account and have seen that they have deducted an amount of R1831.38. I phoned into their offices to question why the amount is so high, unfortunately no one could give me a reason as to why the amount deducted was R1831.38 and not R300. I was told I would have to wait until next week to phone in and request that they refund me - this is RIDICULOUS, the service is PATHETIC. I then phoned my bank and instructed the amount be reversed and phoned African bank once again to inform them that I reversed the amount. The consultant told me that the debit order is NEADO tracked and that the amount will run again - there's nothing they can do to stop this. I find this to be absolutely ridiculous as they were never given authoristaion to run a debit order of this amount. The authorities should look into African Bank and their method of recovering debt at a time like this, when we are suffering the wrath of the Covid 19 pandemic, we also now have to fight to keep the little money that we do have to survive.