Staff does not know how to change debit order

I have attempted numerous times to change my debit order date via email and telephonically just to get an SMS again that my debit will go off once again on the 25th.<br> <br> I DO NOT GET PAID THE 25TH OF THE MONTH!!<br> <br> How many time must I still say this? How many time must I tell your people answering the phones? How many times must I still send my payslip through to prove this.<br> <br> I will inform everyone that what you do is wrong. You don't change the dates and we as customers has to pay bank charges for a debit that goes off wrongly and interest that gets charges from your side for late payment. This is ********* and I will make sure everyone finds out about this.<br>