What would you do?

I have a six year old and her dad has kept her from me for yrs he don't let me see her every time I try he makes up something he don't ever let her call he only lets her call when he want her to I only see her when he wants her to and once I got married and moved away he got mad and took child support out on me which I pay but don't get see or talk to her so its like I am not apart of her life he always says u don't do for her like u do for the others well how can I when u don't let her come and stay with me which I had her for few months cause he was in jail for drugs and bond was so high I did not think he would get out but he did so he took her from school one day and I have not seen her so should I just sign over rights its not like I miss anything anyways oh and him and his wife has her brain wash and she called my husband dad he got mad but he lets our daughter call his wife momma he is nothing but drama