Shortly before the local elections earlier this year we received a polling card for someone who had apparently registered to vote at our address. I sent it back marked ‘not known here’ and rang the electoral services dept at the council, who were pretty dismissive and basically said don’t worry. Now we’ve just had a letter addressed to the same person, and the PO Box on the back is associated with Klarna so it looks like he’s using our address for credit accounts. Do I need to be worried about this and what steps should we take if so? TIA.