Your stimulus payment is not a Social Security or SSI benefit, so the SSA does not have authority to investigate or decide if the EIP has been misused.
But, if SSA gets a claim that someone’s payment wasn’t used on their behalf, SSA may decide to investigate for possible misuse of Social Security or SSI benefit payments. SSA may also decide the representative payee is no longer a good choice and can appoint a new one.
Contact SSA at 1-800-772-1213.
Or call the Minnesota Disability Law Center at 612-334-5970.