Central Security Group - Nationwide INC Guardian Security Systems Fraudulent Billing, they will not close your account! Tulsa, Oklahoma

My issue is when I decided to no no longer use Central Security Group for our alarm monitoring. I called their office and told them that I needed to cancel my account. The told me that I needed  to send a letter in writing to do so. I did. They continued to bill me. We called back and found out that they automatically renew your account whether you want to or not and they do not give you notice that it is occurring. After calling them again we were notified that we have to pay our bill in full for the renewed contract and then it would be closed. At that point I prepaid the final months of the account and they told me it would be closed at that point. 4 months later and they have billed me again. I call again and the guy tells me there was an error and that they would take care of it and assures me that the account is closed. All of this is leading up to today, a month later, and they have now renewed my account and charged me a full month. Again, I call and now they will not allow me to speak to anyone in their accounting department unless we can tell them our pass code which we no longer have. I ask to speak to a manager and they would not allow anyone to speak to a supervisor unless they can verify our code. I ask to speak to the accounting department like I have the past 3 calls and the again tell me they will not allow me to speak to anyone without verifying the code.  At this point I am now continuing to be billed for security monitoring that I do not even have in my home after being assured that our account has been closed 3 separate times. I strongly advise that you do not do business with  this company as you can never find a way to stop paying if you decide to stop using their service.