Debit order date not changed

I have requested for my debit order to be changed last year December starting from January I requested that all my debit order to go off on the last day of the month, to my surprise only one debit order went off on the last day of the month the second one went off on the 27th.<br> <br> I don't know now what must I do I always have problems with you guys if I want to update or claim on my account there is always a problem last year you did the same thing it took your manager about a month o sort out the mess that your consultant did and now im having a problem just to change the debit order date.