Costing Me Money!

This is the second time this has happened. They assured me that they are only monitoring my account and that the debit order will go off once money is in the account. I emailed the lady who assisted me the previous time but it has been a week and I have had no response. They tried to deduct money a day too early and it has now cost me R138 in bank charges. For someone who is trying to get out of debt and who is on a very tight budget, this is a big shock! I would like to have a refund on my bank charges and a gaurentee that this will not happen again!