Extremely poor customer service

I upgraded a system in January. Since then I've been requesting an updated invoice that accommodates the insurance discount. I've sent numerous emails and made numerous calls, without any resolution. <br> <br> My latest statement shows that the account is in arrears for more than 90 days which affects my credit rating. This annoys me! <br> <br> I keep on receiving bills for the incorrect amount and keep requesting the updated invoice but it seems that no one at ADT can assist! <br> <br> Come on ADT, do I need to check out Chubb? Your motto is speed to be \always there ":(<br> """