i had various debts with store cards and catalogues and have spent the last 18 months paying them off. I thought that i was paying the last one off and would be debt free in feb 2011. Yesterday i got letter from lowell finance to say that they had bought a debt from shop direct in may, and that i owe £1800.I cant find paperwork about the account but have looked at my credit file and the debt says that it is satisfied.What shall i do? help please?