According to the CA Franchise Board 2022 Form 540NR, you should contact your employer to get a refund of the CA SDI erroneously withheld.
Basically, If one employer withheld too much they need to fix it. If you had more than one employer, then you can use form 540NR to claim a refund. Since yours is not a problems with 2 employers, your employer will need to handle it.
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