Cancelling contract

I am disputing being liable for a 20% (of retail price) cancellation fee for an inferior device I reported my unhappiness with from the start.<br> <br> I have a complete sequential account of the events. I have asked for the matter to be escalated and was told to email: [Email Removed] I would like to speak to someone who is able to deal with my cancellation rather than a call centre agent whose only responses are off a call centre training script. I've copied the supervisor of the agent I was dealing with on my email and received no response.