Any idea?

My bfs acorns account was suspended for "suspicious activity" and we are trying to get it fixed but they are unable to verify my bfs address because it doesn't match on his bank statement or ID because he has moved a few times recently he gave them other documents to prove his identity but they won't fix his account since they can't verify his address, does anyone have any ideas on a way around this ? He is my referral and my promotion ends on Saturday.