What does your My 48 account page say about your membership status and expiry date? Remember that buying a new membership doesn't mean that it starts immediately if you have an active membership that has not yet run its full monthly course. If necessary contact 48 support about this. See the link in my signature below.
Hope this helps.
I am not a 48 employee so if you need to contact 48 support then use option 3 or the chat facility here.