You employer can downgrade your commission plan at any time if you are an at will employee and it was for a non-discriminatory reason. You have not provided information sufficient to determine if there was retaliation or constructive discharge. You need a consultation with an employment attorney.
I certainly sounds like constructive discharge to me, but I can't guarantee that unemployment will agree.
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I would need more information. You may have a retaliation claim under NY wage and hour laws. Kind regards.
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