Unfortunately, if your employer will not correct your social security number, you are going to have to contact the IRS and paper file with a Form 4852. In all likelihood, the W2s he submits to the SSA will find the mismatch and he will be required to correct it sooner.
See Topic No. 154 Form W-2 and Form 1099-R (What to Do if Incorrect or Not Received).
@britany
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