Humana One Humana Dental Claimed I signed a contract when I tried to cancel policy. Charged me again 2-3 weeks later. Internet

I wanted to get my tooth fixed. I called in to Humana-one dental and was told there was a huge deductible.  So I had them pull it since that was all I could afford.  When i got home I called to cancel them, since the monthly premium was about $35.00USD and the extraction was 100. So why pay them. They claimed I had signed a contract. I did not even know of a contract. They said to write in with a grievance, including my name and number to  request cancelling. I did that. 2-3 weeks later they charged me the premium again. I called back. When I told them to send me proof of a contract I signed they put me on hold for over 15 minutes. While on hold there was no sounds at all, making me think that they had hung up. I have had this tactic used on me before. They hope that the customer will get discouraged and drop it. I did not. 
When the agent came back, he had nothing new and repeated all the claims from before. I asked for a supervisor. I was put on hold again, long wait. No sounds for about 5 minutes, then Indian music.
I young sounding woman came on and claimed to be a supervisor. She said the same things. Claims of a contract I never signed and when asked for an American agent, she asked if I wanted to be transferred over seas. I asked for Humana themselves. She claimed, with a clear Indian accent,  she was Humana. I asked for someone that had the authority to refund my money and cancel this policy that was clearly a scam.  She said there was no one that could do that, that I had to wait for the board to make a decision in 60 - 90 days. I called my bank and cancelled my card.