Fidelity ADT unacceptable behavior

For months now I have been getting statements showing my account is in arrears. I get SMSs indicating my account is in arrears. MY ACCOUNT IS UP TO DATE. I have sent proof of payments month after month and yet this is still not resolved. I called the accounts department this morning and when I gave my name to the person on the other side she hung up the phone. I now get voice mail but cannot leave a message. I have previously asked this person for a phone number of someone else who can assist and she refused to give me the number. There are no contact numbers on the website other that the emergency numbers. Completely unacceptable.