Social Security and Medicare taxes also called FICA might be visible on your W-2 form (box 4 and 6). If you have been working in the US under F-1, J-1, M-1, Q-1 or Q-2 Visa while deemed as a nonresident for tax purposes and your employer wrongfully withheld Social Security and Medicare taxes from your income, you might be eligible to claim the FICA taxes back.
You must first contact your employer(s) and request a refund directly from them. Give your employer(s) 1 month to respond to your request for FICA refund. If your employer(s) does not refund this to you, then you can proceed with the steps in Sprintax to generate your FICA tax claim that you will need to mail to the IRS only once your Federal tax return is processed by the IRS.