My ex made an unauthorized address change on an account he is not a party to
I received a letter in the mail that the address to my DD's UTTMA custodial account that I opened for her had been changed. The "old" address was mine and the "new" address was my ex's.
I've talked with the bank and they are not sure how this happened because I am legally the only person authorized to make any changes or transactions on the account. Not even my DD is allowed to make transactions. It was opened several years ago by me so that I could deposit funds my DD inherited from my father. I later moved those funds to a college fund with my broker (Thank God!) so there was only a small balance remaining in the account.
What concerns me is that if my ex was able to wiggle his way with the bank to change the address on the account, what other breaches of my security will he attempt or accomplish?
Is this considered identity theft if he used my personal information (and passed security questions) in order to make the change on the account?