I'm on OPT, exempt from Social Security & Medicare taxes, but my employer withheld them. They said I'd get them back when filing, but I don’t see how. Can TurboTax help?

You will not get a refund on your tax return.  

• You must contact the employer who withheld the Social Security/Medicare tax for assistance.
• Inform your employer of the Social Security/Medicare exemption for nonresident alien students working on OPT or CPT, and 
• ask the employer to issue a refund of your Social Security/Medicare tax.

See IRS Foreign student liability for Social Security and Medicare taxes

Scroll down to Request refund of taxes withheld in error

If you are unable to get a full refund of the amount from your employer,

• file a claim for refund with the Internal Revenue Service on
• Form 843, Claim for Refund and Request for Abatement and 
• Form 8316, Information Regarding Requests for Refund of Social Security Tax Erroneously Withheld on Wages Received by a Nonresident Alien on an F, J, or M Type Visa PDF 
• with supporting documents.