By joining twice do you mean that you activated two SIMs, have two My48 accounts/logins, and are maybe paying for two separate membership plans etc.?
Seems odd.
What is the €50 a reference to?
There's no plan that costs €25 so it's not clear at all what you're referring to here.
What exactly do you mean by "its still asking me to choose my card or another card to buy a plan"?
What is the exact behaviour and verbatim messages that you're getting?
When you activate a SIM and join 48 then your first plan purchase also involves the payment of the same amount as a one time activation fee.
I don't know if that helps at all?
What does your Transactions page on your account(s?) say about your recent payments?
If you need to contact 48 support about this then see the links in my signature below.
