Findings in TV

I have some findings in the drawer and was wondering what is the best way to get royalties. Should I inform the P.R.O. or try to contact the network/TV station directly? I find my local P.R.O. (ZAiKS) useless since I received $0.00 from them even though I handed them everything with dates, timestamps, etc. Maybe some of you might share the paths of getting paid by P.R.O.