DCF in Mass doesn't use the term "unsubstantiated" any more. Did you mean "unsupported" or "no/minimal concern"?
If the case is "closed" DCF wouldn't be asking to meet. There must be something going on aside from the case that you think was closed.
DCF almost always has the right to ASK someone to meet. The more important question would be "how risky is it for you to agree or to refuse?". If DCF has "concerns" and you refuse to meet, they have the option to take custody of your child or to ask their legal department for permission to file in court to get custody or to ask the court to order you to participate in their meetings.
It is impossible to give you a more precise answer without knowing the details in the DCF case record. You should gather your entire DCF file and schedule an appointment with a Children and Family Law attorney in your area. Use the Find a Lawyer function here on avvo.com to seek out a child abuse lawyer in Norfolk County (there are a couple who post here on avvo) or use the Mass. Bar Assoc or Norfolk County Bar Assoc Lawyer Referral Services to find a juvenile court, care and protection or DCF defense attorney near Braintree to go over your options.
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Generally if the case for investigation is close and unsupported, there should be no further hearings or meetings. It is possible the case has been classified in some other manner and the investigation is ongoing. Wishing you all the best.
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