there is not much point complaining about the amount of the direct debit.
to have a sensible discussion you need to know the meter readings for the last 12 months (actual, not estimated), and the twelve months before that, and work out the cost inclusive of VAT and any price banding, then allow for year-start credit or debit balances.
energy prices have been a lot higher in the last twelve months so even with identical usage you have to expect your payments to increase substantially.
to have a sensible discussion you need to know the meter readings for the last 12 months (actual, not estimated), and the twelve months before that, and work out the cost inclusive of VAT and any price banding, then allow for year-start credit or debit balances.
energy prices have been a lot higher in the last twelve months so even with identical usage you have to expect your payments to increase substantially.