Sexual abuse

I caught my sons fathers gf playing with my 2 year old sons private parts on social media. I called the police, went down to the magistrates office and they said they can’t do anything and I have to go to court Monday. I called dss and all they said was they will document it and that’s it! My son is gone for a weeks with a visitation with his dad and I don’t know where he is. I don’t know the gf either, I’ve never met her. But she use to threaten me and my son for months. What do I do?!