I hope that I've caught you in time. I remembered that I suggested you visit {Professional Name} for {situation}. At the time, I thought them to be of good character.
Unfortunately, since then, I have had occasion to {learn of ethical breach/experience mistreatment/etc.} by {Professional Name}. Obviously, I withdraw my recommendation.
I hope that all is well with you and you are able to resolve your situation.
{Sender}
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