Water damage caused by plumber

[Jason Sung]

Hi, I would like any advice who had similar experience before. I just finished fixing a house with new vinyl flooring. I spent more than $10k for flooring. 

Due to clogged toilet, I hired a plumber who helped another house before. He was busy and he sent another person who he works with. 

When I went to see the house after work, I found water all over the floor. 

The plumber said he does not have insurance. 

What would be the best way to address this situation?