Debiting my account twice without my consent - such pathetic service

We agreed on R1000 debit order arrangement for my loan repayment(which is what I can afford to pay) and they debiting my account twice which means they are debiting R2000 without my consent each month and this is not what we agreed on .......So annoying and frustrating as this is not what we agree on, now every month I need to go and do a reversal which is a bad reflection on my name!!!!

POOR POOR SERVICE!!!!!!!!!!