Unauthorized amount deducted from my account

I have a payment arrangement with FNB loans Consumer legal that on the 25th of each month they deduct R250, as I am unemployed due to Covid 19 pandemic. This month FNB double debited me R 1804.02 with a total of R 3608.05 and I only owe them just over R2000 of what is left of my loan. I have had this issue before with FNB and they wont reverse the money over the phone. You just get pushed from one department to another saying they not allowed to reverse the money. By the last call I was told to do this via the chat. When I tried to do this, Lesego just ended the chat without helping me. The money that FNB took is my rent and food for the month. I am unemployed and need this rectified today as my rent is supposed to be paid today or I get a fine. Please can a Manager phone me urgently regarding this. I need that amount reversed today!!! My contact number is ***.