What is concept?

in 2004 I lost custody of my children.One of whom was recieving benifits already. After four years of fighting for my custody to be restored.I recieved a round about amount of $1900.00. I was told by the state that there was a few other checks that was sent back to s.s.i,and I would be recieving back pay for the rest of the funds within a couple months after my state case was closed. I contacted the s.s.i. office about this and was given a $1300.00 amount that would be credited to me in two or so months yet a week later I called the office back to find that,that was a mistake! How is it that my daughter only accumulated $1900. over a four year time and the four months that she was home in trial home placement I recieved $4oo.00 for her Christmas,however when she was in fostercare, a small portion of her benifits went to the family for her, but the rest of her funds went into a state account that couln't exceed $2000.00 at a time. What do I ?do?