Fnb ripping me off

I have a business plus savings account with fnb. During covid 19 because of lockdown I'm rebuilding my business so I'm not getting paid a salary. So I owed them R6200 on their overdraft. When fnb called me I told them I will pay them R1500 In mid July. And called their call centre saying to stop all debits as I will pay manually to debit companies. So I owed them R4700 after I paid R1500 for the overdraft. They started charging me R110 bank charges like every 2nd day. Now again I owe them R6200 even after I paid them R1500. They can't answer were my R1500 disappeared to. They are ripping their customers off during covid 19 just so they can get rich. Useless bank I'm moving both my accounts to another bank. I'm paying them but they taking every cent for bank charges instead of taking the money for the overdraft owed. They have no compassion for clients during this pandemic their main aim is to ripp off the struggling.