did they contact you by phone .....landline , if so dont give them your current , adrs, but they maybe able to source your current adrs....through council tax records etc.......if they pursue through , county court, then you will have to answer it, unless you want a ccj , and are not that bothered about ccj....... if they dont pursue through county court, they may still be able to record you as a debtor, who hasnt paid, once again , this is all at your discretion.......... u really have not made it clear whether, you actuallu owe them, or its a mistake.........