Your post was blank @VivianC2863 and there isn't really enough information in the subject line to tell what's going on.
You'll need to provide a bit more information than that if you want assistance from the Community Forum.
What does your My48 account Dashboard say about your current membership plan status, expiry date and allowance balances?
Can you make/receive calls and send receive texts?
When was mobile data working correctly for you last?
What exactly do you mean by "topped up"?
What exactly did you purchase?
Membership, add-on, cash credit?
What does your Transactions page say about your previous payment/purchase?
Does your Buy Plan page list any upcoming membership plans?
If you need to contact 48 support about this then see the links in my signature below.
