The starter package for 9.99 euros includes a starting credit (Startguthaben) of 10 euros. In order to be able to book the o2 my Prepaid M package, you need EUR 14.99. The starting credit would therefore not be sufficient. Top-ups in the o2 shops or other shops is at least 15 euros. If the o2 my Prepaid M package was your wish, it was put together for you like this (10 euros + 15 euros).
Hello @GorillaB and welcome to our o2 community :-)
I assume tearsbeforecrying was already able to answer your question. You did not pay 24,95 for a 15 Euro package, you still have some credit on your rpepaid account that can be used with at a point in the future to activate a package that you like :-)
If there should still be any open questions, don’t hesitate to ask, we will answer as soon as possible :-)
Regards,
Lars