Double debiting my account for some idiot who couldn't take "NO" for an answer

I don't know why people like to force things. January i had a call from On-air and i took their decoder and i think it was a big mistake because after some few day a lady called me regarding insurance from the same company. I told her that "NO THANK YOU I DON'T WANT IT" but to my surprise the idiot activated the insurance. Now i am paying two insurances for one decoder. I need someone to help me and sort out this mess. I don't know what happened to good customer service. Now On-Air is double debiting my account because some *********** agent. I need my refund because i didn't sign up for the insurance. I need someone to call me today and sort out this mess or I am taking further steps.