This would not be grounds for a breach of contract action in Arizona but you may have a possible age discrimination claim based upon the facts as relayed. You may want to check with the EEOC. Resigning because of this would likely disqualify you for unemployment compensation. Best of luck.
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Absent a "good faith dispute", which is defined by statue, Arizona law requires an employer to pay earned wages within 3 business days of termination, or within the regular pay period if you quit or the employer may face treble damages. You can also file a civil suit for treble damages (3 times the amount of wrongfully witheld wages) in court. The court you file in depends upon the amount sought. You may want to consult with an attorney as fees are usually recoverable in these cases as well as...
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As others have said, you do not have to appear (which will will result in a loss), but if you are concerned about the outcome, you may want to consult with an attorney as to the likelihood of prevailing. An hour with an attorney may provide sufficient information to allow you to make a decision or to proceed on your own. If you do proceed, you need to be prepared with admissible documents and witnesses you have exchanged.