You can temporarily block your Suits Me card from your mobile banking app.
Go to the menu, click on "cards" and select "block". This can be unblocked whenever you're ready to use it again.
You can do this whenever you stop using your card for an extended period of time, if you can't find your card or if you think it's been stolen.
If you plan on leaving your account dormant for longer you can temporarily shut your account.