I was assaulted by my employer and now he is lying about it.

I have been working for a concrete business for a little over a month now and the job absolutely sucks. On Thursday my boss came downstairs and saw me texting my grandma back, he proceeded to scream in my face for being on my phone. I took a minute then decided to quit. I went upstairs, told him, and he got very aggravated and started shoving me. We then went downstairs I grabbed my stuff to leave and he held me against a door and threatened to beat my ass. After about 30 seconds he let go and I left. I reported this to the sherrifs office and they sent it to the prosecutor. I just got a call from a deputy telling me that he reviewed the footage and he didn't see anything that I said. The story the deputy gave me didn't match what happened at all. What should my next steps be? I'm not sure if i need a lawyer i tried reaching out to a few and no luck so far. Any help would be greatly appreciated.