Sadly most regulators seem, to be next to useless. In your situation you want to budget and manage your finances but are bing prevented in doing this with regard to energy. I recently contacted the communications regulator about the ever increasing number of spam calls (accidents, PPI claims, fliestyle reviews, life insurance, etc.) and the core of the response was to contact the police if a crime had been committed. Yet these people are are blight on many peoples day-to-day lives. About a year ago I contacted the Pensions Advisory Service about an issue in my state pension forecast that I cannot get resolved to be told they only deal with private pensions!

I've been dealing with this problem and have had a fight with the company concerned (no automatic refund, by the way). I got the refund, but have been unable to prevent what is in fact a fairly modest d/d increase. My argument is that if the d/d is set so high that a large credit builds up in summer, it's probably not far out for winter, and if it is too low, then, and only then, should it go up.

All one can do is keep checking the account and demand the refund whenever it's substantially in credit.