Lack of integrity

This health insurance company *****ed me over so bad. I had just signed up for the plan and the rep that helped me said " you can call in anyday and change the debit order date" I receive my payslip I decided to call and change the date seeing I will financial constraints if the insurance 1st debit goes through now. They say they cannot tell me something about the dates which was not disclosed to me at point of sign up. I asked them to cancel the plan, I hadn't received their cards they charged and kept my money. I want my money refunded. Your sales reps lack integrity they do not disclose the most important information about your terms