deleting photos, empty trash
I've deleted multiple gigs worth of photos and movies from iPhone 6. There are only 11 photos left, about 16 mb worth. with iTunes, summary reads 25 gb of photos on the phone. I already selected the deleted photos folder on iPhone and deleted, they are still there. Image capture only sees the 11 remaining photos, iCloud drive is OFF for photos. How can I empty the trash absolutely?
iPhone 6, iOS 8.2