Help Reunite A Father With His Daughters

I've been trying to see my daughter's,who I haven't seen in 10 years. Their grandmother who has custody refuses to let me interact with them at all and ignores my calls and texts. Need a lawyer so I can simply be apart of my kids lives. I have zero criminal record, pay child support and have them on my works health insurance. Yet apparently I'm the bad guy and can't see them...