Capitec deduct Own Decided Installments

I have not experienced this pathetic service with Capitec since I started banking with them 12 years ago. I pay my loans every month and made arrangements for COVID arrears. Seems like they decide what they can deduct as my account was debited R3081.20 extra where previous arrangements was R750 on both accounts. I am not happy at all and feel I want to bank elsewhere. After numerous calls to the Customer Service department all they say is it cannot be reversed. Be careful with your accounts and loans. Deductions of any amounts can be done without you making arrangements. I am discusted and appalled at this banking policies.