an hour ago
47m ago - last edited 46m ago
You can't start a new monthly membership plan early like this.
Membership plans always run their full monthly course.
The new plan will have been stacked on your account's Buy Plan page as an upcoming plan to kick in when the current plan eventually ends.
What you need here is a mobile data add-on if you want to continue using mobile data for the remaining 11 days of your current plan.
If you're habitually using up your monthly membership plan mobile data allowance before the membership month is up then you might want to consider upgrading to the €12.99 plan which comes with unlimited mobile data.
If you need to contact 48 support about this then see the links in my signature below.