How can I get my X play (1563) to correctly report free space internal?

I have a problem with my phone incorrectly reporting free space. I had 9.x gb of my 10.x gb internal memory used up. And I deleted about 7.4 gb of music files. But I think I made an error when deleting them. I did not delete via the google play music app, I used the storage app, and deleted files, and cleared cache. The music is gone, but my phone still reports it as there. I have rebooted, I have deleted google play music ( deleted all updates is all I can do) disabled the app etc. Any help on how to get my phone to correctly recalculate space?

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