"Voice Service" using all storage space.

Hi guys, first of, new to android, just received my Galaxy S7 2 months ago and i'm the happiest of men.
got a lot of tech experience so feel free when answering.
its all started when i copied 2 large files in to different times (gotta love gear vr video)
than i started to see that the phone is consuming more space every day for no reason.
googled for a while to find answers, than found out that the "voice service" is using almost 10!!!
and it's also says it's "data" not "cache".
what do i...

"Voice Service" using all storage space.

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