Frustrating debit orders.

I thought they're professional for the last few months since I had a contract with them. But to my surprise I get debited almost double the amount I should be debited. On top of that they debit the old account I have recently switched my debit order to new bank and it was confirmed that ADT debit order has been switched already. Now my other debit orders should bounce because they depleted the funds I had on the other account.