Obviously someone can do it because it got done.
If the 'we' is referring to some team handling issues it would make more sense. In that case they should have said something along the lines of "I have informed someone who can help"
I have not personally encountered an AI who claimed to be human (as far as I could detect)
The help bot system prompt probably includes some statement about how Claude should phrase everything as "we".
The system prompt includes statements about how it doesn't have tools for managing funds.
A little bit of A and a bit of B and you get a message from Haiku telling you that you can't get your money back said as though this isn't a trivial customer service thing to do.