alredyusedcontent

So not too long ago I purchased the Fortnite starter pack, little did I know that the Fortnite account linked to my Xbox account wasn't my account .so I relink my account to my Xbox account and so I tried repurchasing the starter pack but it says "already
used content" and that "I should go to my library on Xbox and redownload" it but I can't find it in my library what do I do.

pleas help me iv just wasted £3.19 what do I do and how?

or if it is even possible?

thank you

:)