British Gas, EON, Octopus, EDF and OVO customers issued PS237 freezer message / Martin Lewis issues 'urgent' warning to British Gas, EON and EDF customers / State pensioners with British Gas, EON, EDF and OVO given up to PS2,000 each / State pensioners have 'days left' to get PS150 from British Gas, EON, EDF or OVO / British Gas, OVO, EDF, EON, Octopus customers warned they have hours to avoid PS149 hike / Martin Lewis says British Gas, EDF, EON and Octopus customers can get PS332