"I've got it under control"
You'd say you're in control. Payments on time. Limits respected. Nothing spiralling. Whatever this book is about, it's about people who've lost control, and you haven't.
Ask what the control consists of. It consists of paying the minimum on time, every month, and staying under the limit. Both of those are things the card company wants you to do, and both are compatible with the balance never falling. You're in control in the way a person on a treadmill is in control. Everything's steady, nothing's changing, and you'll be in the same place in a year.
The regulator's word for this is the one from chapter 5. Persistent debt is what they call a balance that's been serviced by minimum payments for eighteen months, and it's the pattern of a person in control by your definition. Payments made, limits kept, balance unchanged. The rule exists because the people who look most in control from the outside, the reliable minimum payers, are the ones who never get out, and somebody decided they needed a letter.
Control, in the sense that matters, is the balance falling. Not steady. Falling, month on month, toward zero, by an amount you chose rather than an amount the card chose. If the owed column on your sheet is the same as it was a year ago, you're not in control of it. You're maintaining it, and maintenance at twenty per cent is an expensive way to stand still.
There's a version of this belief that's about being able to stop. You could clear it if you wanted. You just haven't wanted to. I'd only say that a person who could stop a thing that costs them eight hundred pounds a year and hasn't is a person who should ask what's been stopping them, and chapter 4's answer is that nothing feels like spending, and chapter 5's is that the minimum feels like a plan, and chapter 7's is that the level refills, and none of those is a wanting. They're a design.
The method in chapter 20 is control in the falling sense. A fixed amount, above the minimum, on payday, to the dearest card, that you set and the card doesn't. That's a number you chose, going out on a day you chose, in an order you chose, and the balance falls because of it. That's what control looks like, and it's different from what you've had, which is compliance.