Debit without my consent

I had previously made arrangements with multiply to settle my areas balance and an agreement of R923 for every 25th of the month was made over the phone with Lolo from June 2019, when I made a call to them.

I have fail to deposit amount to their account but due to unforeseen circumstances I was unable to make payment.

I feel totally blindsided when to my surprise without any prior notification the bank went ahead and put through a debit order of R2769. 00 on the 25 June 2019 which is a totally OUTRAGEOUS amount as my next payment (July) should have only been R923 as per the agreement.

I am in total distress as I WON'T be able to meet my other living and debt obligations. I still need to pay my rent, school fees, which if I don't pay on or before the 31st of this month, I will be evicted and all my courses will be financially cancelled as well. I also need money for my every day living expenses and other bills that I still have to make this month, such as electricity bill, other accounts payments and groceries.