You need to respond to the letter that you were asked to resign by the owner and COO and that you did what you were told and therefore you do not owe them anything and any revenue as they suggest. Now, you will need to likely get an attorney here to represent you, since they appear to be ready to want to do battle with you, but if you were asked to resign, then you did so at their request and thus the resignation was proper. They are proceeding on the premise that you left without proper notice, but when they asked you to resign, then it is on them.
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