I work in Collections at Orange so I can tell you exactly what's going on. The contract charges are raised by the DCA, not Orange, and are based on you being disconnected for non-payment in the middle of the contract. So if you're on £36.00 plan with 14 months left when you're disconnected, the DCA will chase for your debt plus £504 and admin fees which is 10% of the original fee.
It's really frustrating hearing people disputing an account and not getting resolution so just so you are fully aware and get the best outcome, we are regulated by Ofcom who have laid down our complaints resolution rules which is based on an escalation procedure. This basically starts at frontline then moves on to Manager, then Ops Manager and then Exec/Head Office. In total, we have 8 weeks from the first point of contact to resolve this dispute. If at any point you don't agree with the bottom line that whoever is advising you, you can request an escalation above their head. If it's still unresolved by the time it's reached Exec and a stalemate is reached, then the account is referred to CICAS, the telecommunications adjudicator.
This gets a bit tricky for everyone involved when an account is with DCA because we're no longer allowed to deal with it. You need to contact DLC and request their correspondence address, then send the dispute in writing to them. It's then their decision (as they have bought the debt from us) to request for us to then open an investigation and send the account back to us. On another note, any settlement figure given to you by the DCA is their choice, it is their debt after all.
Also, on a personal level (from my experience at least), using loaded words like 'parasite' and getting involved on a personal level will not get you anywhere because it distracts from the point at hand - whether or not what is happening to you is right or not. Be concise and impartial. Feel free to fire off letters to CEOs but in my experience, nothing ever gets resolved that way. Have I missed anything?