Social Security

INeedANap asked:


I am a full time student working part time in a university. That means my wages from the university are not supposed to be subject to social security and medicare taxes. The people in human resources admitted that it was a mistake, but refused to give me the money back from last year. I’m pretty sure I need to fill out form 843, but I don’t know if I need to fill out any other forms, or what evidence I should send in with those forms. Also, do I need a corrected W-2 form to show that these wages weren’t subject to social security and medicare?
I went to payroll, not HR, my mistake. And yes, they are exempt from taxes. Payroll told me so, but they refuse to correct it.

http://www.irs.gov/govt/fslg/article/0,,id=112712,00.html

On this page, you will see this:
Are there any services that may be excluded from FICA?

Yes, the following services are excluded unless they are covered under a section 218 agreement:

1. Services of full-time students enrolled and regularly attending classes at the school, college or university where they are working. This includes students working for a section 509(a)(3) nonprofit entity organized for the benefit of the school, college or university. See IRC section 3121(b)(10).

You can also check out this link: http://www.irs.gov/irb/2005-02_IRB/ar11.html

I am supposed to be exempt from FICA (Social Security). If not, explain why they have now stopped withholding and admitted their mistake, and refunded my 2007 FICA withholding. Explain why none of my friends at the university have had FICA withheld. Explain the above links. I just want my 2006 FICA and Medicare money back, since it was wrongfully withheld.
Thanks to those actually answering my question, instead of trying to tell me that I’m wrong.