How legal is a verbal agreement?

Question Details:

I had a booking agent that came to me to DJ for a specific company on a month-to-month basis. He would get 20% from me each month. During the last year i asked him to step up and book more gigs for me but was more focused on his other clients and not do anything for me. The last month Iworked I dropped him and held his pay. He is now harassing and threatening via phone, text, email, and online FB and Twitter. Does he have a case? And do I have anything I can do with the harassment?

AttorneyPages.com Important Notice