IPhone still says i have 20GB of photos when i deleted everything?

And before you ask, yes i deleted everything from my recently deleted folder and yes i tried the date & time trick, nothing worked. Its frustrating because thats 20GB i could be using for something else. I backed up all my photos and everything is deleted and gone but it still says something is occupying 20 gigs on my phone. Is there a fix for this? Or will i have to call apple or actually go into the store

Try restarting the phone to see if it still says that is the case.

Why even worry about it and waste your time when you can get Apple support for help. Just call them.

Try a hard reset, that may force it to update the free space info.

Just press & hold both power and home at the same time for around ten seconds, until the Apple logo appears.
It does not delete anything, just causes it to start up as if power had been removed.