DEBIT ORDER ON WRONG DATE!!!!!

I asked someone to go and deposit some money into my account and out of the blue the money is deducted by FNB CONNECT. I called the call centre to find out why they are debitting on a date that we did not agree on ( we agreed on the 26th of every month and they've been using this date since December) the explanation i got was that they sent out an sms to alert customers of this- this sms simply says they will deduct between the 19th and 29th OR ON YOUR SELECTED DEBIT ORDER DATE! WHICH IS THE 26TH.....MY PAYDAY!!! So this installment is apparently for the month of March, ( it's not even then end of February yet) but im already paying for March. If this is how this sim card works then i want nothing to do with it. and please also advise the sales consultants to be clear on the charges, i was told that it was R100pm, i was not told about a caller identity fee for R6. So please cancel this sim and refund my money.!