We are customers since February 2017 and were very happy. We moved in a new house one year ago and then were billed on estimated meter reading. In September, we entered on the app the REAL meter reading, to clarify our consumption. Then... we received bills with "£0" every month. We thought that it was maybe because our initial estimated meter readings were too high... 6 months later, we received an invoice of £750.97 with the explanation: "your meter readings were locked by our system as they were lower than the estimated meter readings that had been billed to earlier. We know this isn’t ideal". But no commercial compensation as we wanted. On the phone: "we are happy when our customers realise this before us" and "sorry, we have a lot of manual stuff in our processes..." Conclusion: - we chose them as we absolutely wanted to have a green supplier - we are astonished and disgusted by the way our account has been managed. - we'd like to stay but we feel abused. We quit for another provider. Thanks for the poor service, Ecotricity! :-(