How do I lock/unlock a direct debit?

You can easily lock or unlock your direct debits:

In S-Net:

Access the "Recurring payments" in the "Payments" menu
Select the "Direct debits" tab at the top of the page
Click on the desired direct debit
Lock/unlock the direct debit by clicking on the icon with the lock

In S-Net Mobile:

Access the "Recurring payments"
Select the "Direct debits" tab at the bottom of the page
Click on the desired direct debit
Lock/unlock the direct debit by clicking on "Lock direct debit"/"Unlock direct debit"