Premier Club membership is only available at certain times of the year (usually November-February) and is purchased as a dedicated package. I'm afraid it's acting as intended, so there's nothing that can be done to fix it.
If you haven't used the membership and you no longer want it, you can
request a refund
.
Thread moved to the Community Led Payment Support Forum, for best results.
(The RuneScape Guides and Help Forum is for assistance with in-game content such as quests, and how-to's.)