Why did you stop paying, was it because you fell on hard times, such as loss of job, poor health, or even just rises in living costs out pacing pay?
If you are here because you are having difficulty paying, are being bullied into paying more than you can afford, there are loads of people here that will only be to pleased to help.
If you just don't want to pay, have you tried the credit today forums. Going there and complaining about CAG not helping you to avoid debts would be good as they love complaining about CAG.