You do not get a refund of the amounts withheld for Social Security or Medicare. That money is put aside for someday when you are 65 or older or disabled and need to collect Social Security benefits and Medicare to pay for your healthcare.
And....even if you begin collecting those benefits, if you continue to work, you will still pay in to SS and Medicare.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**