Does anyone know how I can MAKE my son's father spend time with his son?

I live in the state of Missouri and there is no way I can get child support because the Child Support Enforcement caseworker says it's against the law for the to garnish his S.S.I.(Social Secuirty Supplemental Income). But it's like these agencies aren't really there for the custodial parent just for themselves because they have no idea how to answer my questions. It's never been about the money!!!! I just want my son to have his father in his life because he just turned 7 years old and has been displaying behavior problems for atleast the last 2 years. I think that he is doing this for the simple fact his father isn't in his life. Is there a way to get manditory court ORDERED visitation to make him spend time with our son?