I already pay for 50gb of extra storage yet it still shows I only have 32gb. Why is that?

go to Settings > General > iPhone Storage and see if there are some recommendations.. such as using iCloud Photos.

How to check the storage on your iPhone, iPad, and iPod touch - Apple Support

In addition to what Chris0107 provided, if you are really are referring to iCloud Storage, if you go to Settings><yourname>iCloud>Manage Storage, it will indicate what your storage is being used for.

if you're paying for 'extra storage', that would be iCloud storage. It's not the same as iPhone storage

What's the difference between device storage and iCloud storage? - Apple Support