You can stop a future debit order payment for a given period by requesting a stop payment on your account at a fee. The stop payment instruction will not cancel your agreement with the service provider.
You cannot reverse a DebiCheck debit order. If you did not authorise a DebiCheck debit order, you can dispute it.
If a normal debit order goes off your account and you did not authorise it, you can reverse the debit order via the Money app or Online Banking. Follow the steps here.