Everything. The Bulb website is constantly under maintenance, so never works when I need to check meter readings or make payments. We have received several confusing and contradictory letters saying that we owe different amounts. Have tried to set up direct debit but the website just says 'uh oh' and won't let me select a date or amount for the direct debit. And our bills vary dramatically each month despite not using different amounts of energy. When I rang to ask about several aspects of the service I was told I could do everything online which clearly I cannot if the website is never working. Would not recommend and am looking to change suppliers. Everyone on this website are just leaving good reviews to try and receive £50 credit into their account.