BLUE SECURITY : bureaucratic theft

I had a security account for my previous home with Blue Security. At the end of May this year, I moved from the said premises. I called in to inform them I was cancelling, I was told to send in an email, which I obliged to. <br> <br> on the 3rd of June 2015 I sent an email. However this action did not stop them from activating debit orders in my account and calling me constantly when those debit orders had bounced, threatening me with legal action. I informed them time and time again, I am no longer a client nor do I live in that address. The lady ( if I should even call her that-Charlotte) rudely called me time and again and I will tell her the same thing over and over again. <br> <br> Two weeks ago they sent an sms threatening me with being blacklisted, again I had to speak to this human being who is helping this company ****** money for services not rendered. This is the last humane attempt in dealing with this matter, my next step is not going to be so kind. <br> <br> <br> Their whole defence is based on them pretending they did not receive my cancellation email, which I have resent. This technicality should be neither here nor there as I have verbally expressed the cancellation.