If Humana's failure to cancel your contract caused you an economic injury, you may be able to style your complaint such that the contract was breached by the failure, and therefore you are entitled to healthcare coverage by Humana for the losses sustained.
Ordinarily, however, Humana's negligence, if the only damage to you is economic, is not recoverable in a legal action for negligence. Negligence requires an "impact" (physical injury or property damage).
You may want to try your State Attorney General's office for this complaint: http://myfloridalegal.com/consumer.
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