If the difference is close, maybe off by a paycheck, perhaps you did not get your last payment.
You need to contact Human Resources for your former employer and ask questions.
It is easiest to file with the W2.
If you are 100% sure you want to argue the case, you can try this:
Call the IRS toll free at 800-829-1040 or make an appointment to visit an IRS Taxpayer Assistance Center (TAC). Please click on this IRS link for full instructions and information.
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