You should contact the Minnesota Department of Labor and Industry (http://www.dli.mn.gov/main.asp) to see if they can assist you. It's not clear if a "consultant" is included in the definition of an "employee" for all purposes under the relevant MN employment statutes; however, if you were covered as an "employee" then you may be entitled to additional sums from the employer because employers are required to pay wages to employees who have quit by the next regular payday or, if that day has passed, within 24 hours of the ex-employee's demand for payment. If the employer does not pay within 24 hours of your demand, then the employee is entitled to money equal to up to 15 times your average daily earnings. Keep in mind that I am not licensed in MN and do not regularly practice labor law in any state; however, my cursory reading of the law and the information on the MN DLI's website tells me that you should contact them as soon as possible to see what sort of help they can provide you with.
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I suggest contacting the MN department of labor for assistance with this.
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