Debit order to be processed urgently

I have been battling with Cellc to debit my account for this month. The reason for this is that on the agreed debit order date which is the 26th of each month there were insufficient funds in my bank account therefore I made an arrangement with them to debit my account on the 3ed of this month. Tgey didn't do that, yesterday I called them and they said they would debit today, today they didn't. I just called them now and asked them if they could debit this afternoon , they have done this previously the lady said she is not sure because my account is already with their credit dept and they are the ones who handle matters of this nature. My worry is tomorrow there might not be enough funds in my account and this could result in them suspending my services. Can they please debit my account today. Like I said there has been times when the debit order goes off in the afternoon I am not prepared for a suspension. I have been dealing with them for the past 3 days and nothing happened. I NEED THIS DEBIT ORDE TO GO THROUGH TODAY.