Utterly useless and unhelpful

I have been a customer with supersonic for over a year and I have not had one positive or helpful interaction with them as a result I had decided to cancel my subscription with them, I followed all the terms and Conditions that they require for a cancellation. I gave them one months notice of my desire to cancel and then hear nothing. I phoned their call center at least three times too confirm cancellation and all they can tell me is that the cancellation department will be in contact with me at some point in the cancellation period, the whole month of August. I did eventually get a email regarding cancellation, they did however state in the email that they would need to collect the router at cost to me once the contract was canceled when I had in fact paid upfront for the route I decided to ignore this as a generic email as i did not feel like contacting them AGAIN. Then today I received a invoice for the month of September from them and when I phoned to enquire this I was told that I must email te cancellations department I told then person one the phone that I would like to speak to the cancellations department as they are very unreliable when answering emails and I was told that there is no direct line to the cancellations department so the only way to contact them is via email when I asked what else can be done the agent just told me 'I dont know what to tell you' this company is utterly useless DO NOT GET INVOLVED WITH THEM.