Adt threatens with black listing clients because of their own incompetence

Please dont even think of signing up with this company, today i called them to cancel my subscription with them because of their horrible service. Yesterday we tested the panic button to see if our service is still active up until now i am still waiting for them to call me back to hear if everything is ok. To cut a long story short i called the call centre today to cancel my debit order only to have their agent Richard tell me i cant cancel telephonically. I will have to send an email.. Imagine i am telling him to cancel the debit order while he is telling me to send an email. Why dont u tell your clients beforehand that they shouldnt bother to phone the call centre and just send an email to cancel??? Eventually i end up telling Richard i wont as this is suppose to be a call centre he is welcome to send the email on my behalf. So i tell him its fine i will cancel the debit order with my bank.. Richard tells me i should just remember that after 3 unsuccessful attempts they will BLACKLIST me..... I will patiently be waiting for them to blacklist me. As far as i know i only signed a 2 year contract and my 2 years is long up so based on what are u going to blacklist me. STOP THREATING US and rather concentrate on providing the service we paying for.