Luke Steidlmayer Downey Brand LLP Scammed my grandma! sacramento, California

Mr. Steidlmayer works for the biggest law firm in California, located in Sacramento called Downey Brand LLP. My grandmother went in to the law firm to find a lawyer to change her will, and fix her properties paperwork and set everything straight. Mr Steidlmayer told her he would do this on the side and not through the firm so she would be able to do this for less. My grandma agreed and handed him over a $10,000 USD deposit in cash as he asked. She handed him over all the paperwork needed to fix any property issues and told him what he wanted her will to be but never received any paperwork back. He called her a few weeks later to ask for more money to close the matter and she handed him over another 10k, again, in cash as he asked.  He told her all matters were settled but gave her no paperwork to confirm this. When I found out about this I was shocked that my grandmother had done this and did not trust Mr Steidlmayer so I investigated her properties and her will and everything was the same as before he was hired. I also suspect that he was waiting for my grandmother to get really close to dying before making some strange sketchy move to rip us off. I have, since finding out that Mr Steidlmayer scammed my grandmother, tried to contact him every day to get my grandmother money back and he denies ever having any contact with her as he never gave her any receipts and no moves were made legally. Now when I call him, as soon as he recognizes my voice he hangs up. I tried to report him to the California State bar but they asked me for the proof of payments but he never gave my grandmother any. I want to warn everybody to stay as far away from him as you can! and warn everybody you know, your grandmother could be next!