Error in stop order deduction

I was at Standard Bank in Canal Walk on Monday just before 11:00 am and could not have been helped because the system wasn't working.<br> I went back in the afternoon, waited in the queue for 20 minutes and wanted to increase my rental payment stoporder amount from the first of April. I asked the lady at the counter to change the stoporder so that the increased amount would only be deducted from the first of April - the March payment should be the same as before. I asked her again after she made the changes that it is only for April since she didn't give me a paper to sign as I usually got from STB when changing a debit order. Today I got an sms that the debit order went off for the increased amount, so I paid R 300 more than I was supposed to for my rent!!! I'm really angry about this and expect standard bank to refund me the money, or I will go to the newspapers - I know many people who work for Die Burger. This is unacceptable and I don't have time to continuously check everything my bank is doing - I saw this by accident. How many other deduction has been done that I didn't even notice? :-(