My parental rights were terminated and I feel like there were many errors and rights violated. Next steps?

Children removed from there dads home where they resided, I have never had a open cps case regarding me as subject. Never had a cps worker visit me in my home after children removed, never invited to join in on dr appointment, mental health appointments, school functions nothing regarding my children. Reunification remained with weekly phone call and monthly visit that occurred every 2 weeks. Untill they allowed children to make a choice of not talking seeing or anything from there dad. Then my visit dropped to 1 monthly visit with my 2 daughters and 2 monthly visit with there brother. Time was removed . List goes on. Un updated case plans, lack of communication. 2 foster homes stating how horrible communication was there was a lack of any assistance. And a gut feeling. That something is wrong