Unfair finance charges

<p>I bank with standard bank. My account was overdrawn as 1 of my debit orders went through a day before my pay date, and it's been like that for the past 3 years but this time the debit order was returned. Every time when I realise that my account is overdrawn I immediately, first thing in the morning, transfer or deposit money in the account so that my debit orders may not be returned and avoid charges. It always worked but not this time. Seven of my debit orders were returned at a charge of R115 per debit order despite my effort of transferring the money into the account. I called standard bank call centre and they say it's the system and there is nothing they can do. I think it's unfair. Please help.</p>