That is what I want to know,"Why"is it going up. The last 3 months we cannot have used enough energy for our existing payments not to cover. I have come to the conclusion that energy suppliers are all thieves and robbers,I thing it's time for the government to investigate them.
You might start off by asking them why they've increased the direct debit payment, before branding them as thieves and robbers. That is, assuming you'd rather get to the bottom of this. If you'd prefer to rant, carry on, but it won't actually change things at the end of the day.
Now - when you signed up with this energy supplier, either you or they created a forecast of how much energy you would use over the year. They will have calculated the monthly direct debit on that basis. Remember, as
@Uneducated_Rick pointed out, the monthly payments will be equal but your energy usage won't be; you'll be over-paying in the summer and under-paying in the winter. For a simple illustration, if you pay £100 per month, you might actually be using £50 worth of energy per month in the summer and £150 worth per month in the winter. So the first thing you need to do is dig out that forecast, or anything you have from your supplier that explains how they calculated the monthly sum.
Next, you need to look at how much energy you've been using over the last few months and compare that with how much you used last year over the same time period. Going back to that simple example where you're paying £100 per month, if you've been using more than £50 worth per month recently then the supplier might think you're going to use more than £150 worth per month in the winter, and suddenly the £100 per month payment isn't enough. So they put it up a little bit now in the hope that it will all balance out over the course of the year. If they don't, they might have to put it up a lot when suddenly you're using £200 worth in the winter instead of £150.
Does that get you anywhere?