Posting anonymously for obvious reasons...
I had a "Creditor's Notice" from Carphone Whorehouse's debt collectors for a sum I didn't owe last week. Emailed CW who, somewhat surprisingly, actually replied. Except that they didn't know what phone number this claim referred to, even though I'd provided them with the account number referred to in the Notice.
I've replied since, telling them that it could be one of two numbers and I've supplied them with both. In the meantime I've had a rather nasty phone call from a debt agency used by CW asking me, with a certain degree of menace, when I was going to pay the outstanding amount. I told them I was paying nothing until I had some notice from CW as to what the outstanding amount was about. They just said "See you in court" and hung up.
This may not be relevant, but about 18 months ago I went for an interview with CW where they admitted that their accounting system was very out of date and in need of a lot of work. But I'm sure that's not relevant now. I'm sure it's all been brought up to date.
Now - I may not be right here, but I believe that whether their claim is correct or not, the mere fact that they may take this claim to court will reflect badly on my credit rating, which is something I'm not happy with. However, I'm sure they'll choose to deal with my small claim for defamation of character out of court rather than taking it any further.