I filed my taxes saying that I didn't receive the last two stimulus payments. I have since realized they have been deposited in my ex-husband's account, what do I do now?

Also, he has not sent me any of the money as of today (May 13). I seriously don't know what to do to get my money and if I need to amend my return because the IRS did actually make the deposits, they just did it into the wrong account.