Vox incompetence

Vox Telecom is utterly useless and ***********. I have for months now been trying to get a breakdown of the cancellation fee that they allege I owe them. I spoke to a manager named Damian months ago who was initially very helpful and he promised me a fee breakdown. Months later and still no fee breakdown despite requests for him to call me back. Today I received a demand for payment of the figure (without a fee breakdown). I called Vox to try and speak to Damian the manager, but was told via a sales operator that Damian said I must speak to the billing department. Eventually Damian reluctantly agreed to call me back- and still no call. I had spkken to Damian specifically because the billing department were not sending me a fee breakdown. I spoke to someone again today in the billing department and she could not either help me with a breakdown. How does Vox keep customers? The mind boggles. I want to pay them a reasonable cancellation fee (as per the Consumer Protection Act) but I cannot tell if the fee they demand is reasonable because I get no breakdown. It is like dealing with Home Affairs, pathetic.