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Did that once, and they just hassled me to change it again, and then they just changed it automatically.
I know what the problem is, they have a simple calc that checks DD vs usage, but mine varies so much between Summer and Winter, that you need to look at how much I'm paying over 1 year rather than just the last 2 or 3 months. Their shit algorithm predicts that I'll go into debit, but doesn't acknowledge over the year it evens out.
Nobody there is helpful at all.
Despite knowing exactly how much I use, because I've been with them for years and years, they keep upping my DD. I'm currently hundreds in credit, but they refuse to reduce my DD back down to £55/month.