Can a company refuse to let an employee cancel their health insurance when the cost is deducted from the their paycheck?

Question Details:

My hours were recently cut from 40-50 per week to 8 hours per week. I can no longer afford my health insurance, and tried to cancel it, however my H.R. dept is refusing to let me. The cost is deducted from my check, so basically I am working for free. Important Notice