Nightmare. Similar happened to my brother a few months back. He and his wife were away for a few days and someone managed to hack into one of his accounts. He had his suspicions but couldn't prove it, so likewise had to close accounts and change passwords. I had to change online banking password as bank said that there had been a possible breach. I'm getting so confused with passwords, as I use so many different ones.
Just as well you got a text HB!