I'm paying £62 a month (2 people in 3 bed terrace) to Thames Water. Because of this thread I logged in to check my account and can see I have £250 in credit, but they won't let me reduce my monthly DD. I guess I'll have to give them a call.
This behaviour has got to stop from these companies. Withholding our money so they can make bank.
That's not generally how water companies work. They don't issue you with monthly bills for the most part. So if you are on a monthly payment you keep adding to the bucket and it gets drained usually when they issue a bill at typically 6 months. Or you can just budget properly, wait for them to issue a bill and it just gets taken from your account by DD.

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