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Hello, are you there?
You MIGHT have a cause of action in civil court for what is called undue influence. That basically means that these people used a position of trust/advantage to convince (with false information) this person to cut you off. Its a form of fraud.
The best approach is to talk to a local attorney. Most will consult for free. While litigating this might be expensive, if there is $1M on the line, it might be worth it.
I hope this helps.