I'm so sorry to hear about your frustration and difficulty. Your description of your situation certainly sounds dispiriting, but I'm sure many could learn from your obvious resilience. Unfortunately, I can't comment as to why you're struggling to get connected to the right organizations or people within the right organizations. Programs and processes tend to be very community-specific. If you've not already tried it, you might look into http://www.thehotline.org/, which is a national program to help women, men, and families in domestic violence situations. They may be able to better direct you and to connect you with local groups with whom you can see about working as an advocate as well.
I certainly wish you success in your endeavors and continued safety.