You'll need to provide a bit more information and context than that if you want assistance from the Community Forum.
There's no €12 plan on 48.
Did you mean that you bought a €12.99 membership plan?
What does your My48 account dashboard say about your current membership plan status?
What does your Transactions page say about your recent payment?
Are incoming/outgoing calls and texts working ok?
When was mobile data working ok for you last?
Are your APN settings configured correctly?
If you need to contact 48 support about this then see the links in my signature below.
