Breach of Severance Agreement

My employer terminated my employment without cause 90 days after I started work. The two-year contract clearly precluded termination except for specified causes (mostly violations of law)for at least a year. Ultimately, we settled for the full year of pay and benefits. A severance agreement was written and signed which included the company's commitment to keep my health and other insurance benefits in full force. Many weeks later, I discovered the employer had actually terminated all my benefits, even while continuing to deduct the premiums from my continuing checks. I said if they were not immediately reinstated, I would arrange for my own, individual coverage for which I expected the company to pay, including retroactively the lapse period. When I got no immediate assurance, I sent the company a demand for the cost of the individual policy, saying I could obviously not depend upon them to provide it without lapse. The company then claimed it was "a mistake" and promised to get it reinstated soon. I say I'm entitled to ALL the cost of my individual insurance back to the actual date that they wrongfully terminated it in violation of the severance contract. Is there a Florida statute or principle of law that backs me up?