ADT Security Services Harassment on a closed account,billing inconsistencies Aurora, Colorado

I had been a customer with this company for over 4 years and fulfilled my contract with them. I was on a auto pay service and they were paid on time for the sub par service they offered.  In 10/2012 when my card was due to expire I called to cancel my service.  The representative I  spoke with only asked me for minimal information, customer number, name, address, phone, etc.  and said my service would be cancelled at the end of October.  As this service is paid 1 month ahead of time I asked if everything is paid in full and final and I was told yes. 

In November I received a bill in the mail, as I was on auto pay prior I had assumed it was their system catching up to my cancellation request.  When I received a bill in December I wrote on the bill that I closed the account in October 2012.  

In January I got another bill and called and was told that the person I spoke with in October never notated my account and that they could not close my account until December when they received my written request and I owed over $100.00 for November and December.  I indicated that it is not my fault that their representative did not notate my account and requested to speak with a manager.  I was then transferred to a Manager by the name of Perian.  

I explained the situation to Perian and was told that by account did not have any notes regarding a cancellation until December, and that whoever I spoke with in October did not process the cancellation correctly, again I indicated this is not my fault.  Perian requested that I Fax her a letter requesting the cancellation and I asked at that time if that would remove the past due amounts, any late fees, and any negative remarks on my credit.  She indicated that if I sent the letter it would .  The next morning I wrote my letter and faxed it over to the fax number that Perian provided and sent copies of all bills along with my letter on January 23, 2013.  

In February I received another Phone Call regarding my past due balance, and I asked if they received my fax and was told that it was not checked in yet because they have only 1 fax machine for all customers in the US...really?? I thought that was ridiculous. 

I then received a bill in February and sent all my copies of Fax, bill, letters, to them and requested they stop calling me for their error. Since the beginning of February I have received 2 calls from ADT every single day.  I have only started tracking their harassment since 2/20/23 but have recorded the following calls.

2/20/13 1st call at 8:07 PM, 2nd call at 8:12 PM
2/21/13 1st call at 3:05 PM, 2nd Call at 3:11 PM
2/22/13 1st call at 5:48 PM, 2nd call at 5:54 PM

I just want them to close my account remove any balance on my closed account, and remove any negative credit ratings they have reported as I have a good credit rating. 
And of course leave me alone and stop calling me. 
By the way I received another bill today, 2/22/13, and on the same day received a request to get my service back along with 2 free months....Really I don't think so!

So they want to harrass me for a closed account and try to sway me and get my service back....