This has all the hallmarks of a scam. I advise caution.

This appears to be related to criminal law rather than social security so I have moved it to that section.

If you are paying US social security withholding taxes then yes.

A local social security attorney will likely have contacts at the local field office or DDS office and can make inquiries on your behalf thus...

If the checking account has $30k then he is way over the limit for those receiving SSI who are limited to a maximum of $2k in assets. So, assuming...

You can agree to their demands, negotiate, or tell them to go pound sand.

I agree with Mr. Kalish although your post is unclear as to whether you receive SSDI for disability for SS for retirement. Either one of those...

I agree with Mr. Rafter. This is an all too common scam these days.

This is almost certainly a scam and an all too common one these days.

Lawyers are not allowed to contact you directly. Use the Avvo "find a lawyer" tool and make a few calls.