African Bank is not reliable

I'm so disappointed with the service received so far, had previously made repayment arrangements, which resulted in my account being in arrears which I repaired earlier this year but account never ceased being in arrears even after the account was paid extra and reinstated the contract debit order amount, to date acc is arrears and those unskilled customer care consultants who can't explain the how part, this is a *******, I'm interested in taking this further as I know for a fact that my acc can't be in arrears but rather is paid extra.