recieved a letter tody from a company saying i owed 1200 pounds to a credit card company, i have never had a credit card with this company, indeed it is only this year i begrudgingly had one, they say it was from 1999, but t that time i know it wasnt me, as i was working in Germany at the time, the women on the end of the phone, started to ask me personal information, which i did not give, i dont give out that sort of information over the phone or online, it seemed they had very little information,can someone tell me what to do, in case they come back to me with this, many thanks for your help