If you want assistance from the Community Forum then you'll need to describe/explain the problem that you're having in more detail.
What exactly is the problem?
What exactly do you mean by "top-up"?
Buy a membership plan? Add-ons? Cash credit?
What happens when you try to buy something?
Any error messages?
If you're using the app then try the web interface instead in case it makes any difference.
This is the link to the website:
When were you last able to buy stuff on 48 last?
If you get to contact 48 support about this then see the links in my signature below.
