Debit order went off middle of month

What a surprise we had yesterday!! We went to the ATM to draw cash and Russells has taken money via debit order without any notice. And this is not the first time they put early debit orders through. This is bridge of contract from their side as I signed for the debit order to be deducted on the 1st of each month. I am going to reverse this debit orders today and will also cancell the debit orders at my bank and will pay them each month at MY time!!!!