will he be covered or need to withdraw from ssi/ medicare?

my son who has downs syndrome started receiving ssi/midicare at age 21 1/2. He recieved a letter wanting to know all info on a insurance related settlement/trust he started recieving payments for. We were advised that a settlement of this kind was not income and the government did not use this as an income and is not reported. SSI wants the original documents which are sealed by the courts and we are not to discuss them with anyone.

What are we to do. SSI also refused to pay him from age 18 years but said he owed 3,000.-4,000. from when he was a child. They are no taking payments from his SSI for that.

He recieves 340. mo, if we need to drop him out we will, due to to much government snooping into private affairs. Why do the back pay most people to age 18 but refuse his . The SSI rep was very rude and disrespectful. So we really do not like dealing with them.

Thank You