Debit order date

Someone called me to change my debit order date only for December , mind I didn’t call they asked me when do i get paid and i told them and they asked if it will be fine if they deduct on the 22nd for December. I agreed but that wasn’t for monthly because i dont get paid that time. Came to my suprise this month my debit order goes off on the 25th when i get paid on the last day of the month. Now i owe the bank 115 because I didn’t have money in my account and i was jot prepay for this.