Hello have 16 GB iPhone. tried to download but it has refused to install have tried everything even deleting more than 8 other apps It still says have to go to settings to manage my storage and not enough storage on phone Help iPhone 5

Hello ! I have a 16 GB iPhone. I tried to download Fifa 13 but it has refused to install! I have tried everything even deleting more than 8 other apps! It still says I have to go to settings to manage my storage and there is not enough storage on the phone when there actually is. I have been on this for over a day. Help!