I see that this plan is set as yearly and for 10 Euro. https://www.raklet.com/kerkis/Manager/CustomMemberTypes/Edit/53bc7818-3100-48cc-b289-849c8f29c43b
It will renew each year and keep adding debts to your contacts automatically.
If you want to cancel their membership if not paid after the year, we need to update the plan in the background
In that case, their subscription will renew on Jan 1st automatically. It will add 10 Euro debt. Then try to collect payment for 10 days and it will get cancelled 10 days after if the payment is unpaid. You can choose to remove their debt for the new term.