I was working as a contractor through an agency. I had purchased medical insurance which was deducted on each pay check. My last day of work was on March 16, 2012 and they continued to deduct for the medical insurance. I received an email stating that my medical insurance was terminated as of February 16, 2012. However, on my last check which was on March 27, 2012 they still deducted for medical insurance, as of today I received a letter stating that my cobra coverage began on March 1, 2012. Is this legal? Please advice.