E-on have sent my partner a letter threatening a debt collection agency if he doesn’t pay December’s bill by 4th Feb. He moved out in October, reading them the meter as he left. He was nearly £200 in credit which the company repaid to him in November. He has phoned the company numerous times but they insist the bill must be paid - they read the meter on 20 Dec apparently. We don’t have paper bills for Oct-Dec. Should we pay the bill tonight?