EARLY DEBIT DESPITE SELECTING PAYMENT DATE

I am very upset, I selected my payment date as 28 December online early in the month already and now you are trying to debit my account from today? Why would I make the selection of I know I am getting paid on my normal pay date and what gives you the right to try and debit money early when you asked what date I get paid on and I explicitly selected my normal payment date? Why is going to pay for the skipped debit orders and now it is going to show I missed my payment when I did not!!! I said I get paid on my normal payment date? I want this sorted out today or I will report you to the FSCA and to the consumer council. I am sick of the problems dealing with your company.