Castle Dental — a refund

Yes I had an account that had a remaining four hundred and something dollars on it for future appointments. I received a letter about a month ago saying that the amount left in my account was going to the state unless I signed and filled out the paperwork and mailed that I did all of that and I have not heard a word from anyone and I need to know what I need to do now because it's over $400 and I could use that.