Unprofessional Manager - Software Developer GE HealthCare Employee Review

When I told my manager that I didn't get my paycheck after returning from paternity leave, his response was, "Haha, that sucks." I still have unpaid wages from them 6 months later. Manager tried to get me to work during my paternity leave. I extended my paternity leave into unpaid time, he called me up and told me it wouldn't be good for me to do that. When I came back from paternity leave he wrote me up for not working, which is an FMLA violation. Contacted HR, but the guy is in another state and just didn't care.