I don't want my purchases synced?

My purchased songs keep syncing to my iphone when i didn't check the purchased playlist. Some of the songs are not on the music playlist i synced to my phone but the keep staying on my phone when i don't want them there iv'e tried deleting from my phone but it won't work. I hope this isn't confusing but how to i stop purchased items from syncing to my phone?

There are a few options here.
1. Go to iTunes and plug in your iPhone. Then go to the iPhone and then click on the Music tab in the iPhone. If you look there you will see the following "Entire Music library" & "Selected playlists, artists.etc"
So click on "Selected playlists, artists… Etc"
Then manually select your music by artists, playlists, genre, or album.
In the playlists section, make sure 'Purchased' is NOT selected.

2.In your iPhone, go to Settings, then go to iTunes & App Store, then uncheck Music for automatic downloads.

Hope this helps.