E.ON no help as our building is without hot water for a month

Tens of people complained but we were constantly told the problem was being investigatedI live in a new block of flats in south-east London. Our hot water and heating is managed through a district heating system by E.ON Energy. For the past month and a half we have been without hot water, or at best lukewarm water intermittently. Despite tens of people raising this complaint with E.ON, we are told we are the only one affected and an engineer is sent out.We have raised a complaint centrally but n