Social security and medical taxes deducted on OPT/F1
I was on F1 status from August 2009- January 9, 2012. My OPT started from Jan 9 ( effectively still f1 visa status), my employer deducted medicare and social security taxes during the period of January - March, I applied for H1 in April and got approved and effective in Oct. As I understand I shouldn't have paid those social and medical taxes during that period. I asked my employer about the deducted taxes and they said its not in their hands. I want to know if there is a separate form to describe those deductions and also if I am eligible to use turbo tax based on Substantial presence test ?
Also. social and medical taxes were also deducted from April until October, do I have to claim that too? I got H1 approval notice in May though the H1 starts in Oct.