2 part post
This looks as if it was a charge put on because they had got a county court judgement (ccj) for a debt, and you had not complied with the judgement. Are you saying that you do not owe them any money and never did? Or are you saying that there is no proof that you owed &/or owe them money? These are two very different things!
If you did owe them money & have not paid it then it is difficult to see how you can get the charge removed without paying the money, plus the interest which will have been added. (If the did get a ccj & it was for more than �5K then they are allowed to add interest.) You could try arguing that you never had a debt to them but if you did so on oath this would be perjury. Or you could ask for the ccj & charging order to be set aside on the grounds that you were never advised of them. But this would only succeed if you were able to get the judge to accept that - if you had known about the case - your defence would have resulted in the outcome being different.