You'll probably have to contact 48 support about this. See the link in my signature below. Several people have reported problems buying or activating memberships recently. And the app is not working since last week. So there are system problems which are persisting in spite of support telling people that things will be rectified soon.
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.