You still got your book. These people got their psychic readings. Just from a different source.
Can you prove that the different source was of lower quality, for something that you can't prove quality for in the first place?
It reminds me of famous artists where a lot of their work was done by assistants.
Should I be able to sue a celebrity when their autobiography was ghostwritten but that wasn't publicly disclosed? Or when their tweet is written by a publicist? We seem to have decided the answer to that is no.