Maybe try a certified letter first? Also, they don't require YOU to ack, they require SOMEONE to ack, as I don't see anywhere where they actually have the "ack

Maybe try a certified letter first? Also, they don't require YOU to ack, they require SOMEONE to ack, as I don't see anywhere where they actually have the "acker" verify that they are the account holder. I wonder if there is a legal loophole that the account holder could use as they can't prove that the account holder is the one that acked.