You'll need to provide a bit more information than that if you want assistance from the Community Forum.
What exactly do you mean by "top up internet"?
What did you purchase?
What does your Transactions page say about your recent payment?
What does your My48 account dashboard say about your current membership plan status and expiry date?
Are you on the unlimited data €12.99 plan or one of the cheaper legacy plans with a limit on the amount of mobile data?
When was mobile data working ok for you last?
Are incoming/outgoing calls and texts working ok?
If you need to contact 48 support about this then see the links in my signature below.
