Extremely poor service from ADT Security!!!

I've gave ADT 30 days noticed to close my account when my 2 year contract came to an end. They rep**** to my email thereby acknowledging it was received. However, looks like they decided to ignore my request and keep the account open. I've tried reaching out to them since but all I get are automated response with references numbers saying someone will get in contact with me. My concern is that debits orders will continue to be taken from my account and FNB is currently not making provision for disputing debit orders. Not even able to describe how bad the service is when you decide to complete ignore customer communications for weeks.