domestic voilence

i am a victim of domestic voilence my 2 children have been took into care on a setion 20 as the social serverces said i can not protect my children i have contact with my children at school from half three to half four everyday i was told the carer will phone me today with the adress for me and heard nothing they removed my children due to my daughter answered the door to her dad which he is not to have contact i was not aware he was in the house untill morning there for i took the girls to school and whent back to the house and told him he had to leave refusing to go i collected my kids from school and told my dad who then told the school and school informed the police who then took 17 hours to remove him and put him 2 doors away from my house even now he was warned by his probation officer he wasnt allowed near the kids