Cancelled service never cancelled!

<p>Due to us moving house in May this year, we had to cancel our subscription. I gave a month's notice, as advised by ADT, then received confirmation in writing that my service would be cancelled on the day we vacated - at beginning May. Today, I received an SMS threatening me with legal action because my debit order bounced to the tune of approximately R705. I called ADT, and was put through to the credit department. After 10 minutes, still no-one had answered so I hung up. I have sent an email asking that someone contacts me and still no reply. I will be taking this further unless this issue is resolved (and I receive proof thereof) and I receive an apology within the next 24 hours. </p>