You'll need to provide more information if you want assistance from the Community Forum.
What payments did you make?
What did you buy? Membership plans, add-ons, cash credit?
What does your Transactions page say about these payments/purchases?
What does your My48 account Dashboard say about your current membership plan status, expiry date and allowance balances?
Can you make/receive calls, send/receive texts, use mobile data?
What exactly do you mean by "my plan was not defined the first time"?
What exactly do you mean by "paid for plan but no activation"?
If you need to contact 48 support about this then see the links in my signature below.
