Unhappy client

I’m really really angry and sad as well as frustrated because this is my first month on my new job since I was unemployed for a few months and capitec took almost all my salary and settled the loan I had with them.Now I don’t have any money for food,transport to work e.t.c because they are refusing to reverse the funds and take what we had agreed on on the arrangement I made with them early Jan.This is what happened I had a 24 month loan which I paid every month until I lost my job and couldn’t manage to pay anymore for the 6 months that was remaining but I continued to pay any amount I could afford as I agreed with them till October 2019.In November I no longer had any means of paying anything at all and I informed them that I couldn’t pay anything at all since I had no one to help me financially and they said I should let them know when I get a job so that I can continue paying.So I got a job in December and my first pay was supposed to be in January.I never used receive my salary on capitec bank before I just had a loan with them but since now I got a new job I decided that I’ll receive my salary on my capitec account and since I still had an loan I need to pay I called them and let them that I got a job now and I will be receiving my salary on my capitec account so I would like to make an arrangement to pay the loan since I can’t afford to settle it with all of my salary.The lady who helped me on the phone at a capitec branch agreed and even said she made a note on the system on the amount I’m arranging to be debited when I get paid .Now I got paid and capitec took almost all of my salary and settled the loan whereas I had made an arrangement with them.when I go to the branch and explain they called the relevant department but they declined my request for the funds to be reversed.How am I gona survive now since the loan took almost the whole salary when I made arrangements with them and why did the lady agree to make arrangements if they were going to take all the money to settle the loan? I’m really not happy about this because I just started using capitec full time and they decide to do this to me.