Does "wouldn't" always mean someone refused?

It can express refusal, but it can also describe repeated negative behaviour in a past setting. This exercise accepts "wouldn't" and "didn't use to" in some such sentences; don't treat them as interchangeable for every past state.

Can I write "never used to" or "used not to"?

Both are possible. "Never used to" stresses that something wasn't a past habit; "used not to" is another negative form. This exercise accepts them in some answers. After "didn't", use "use to" without the final d.

Home Grammar Used To ExercisesUsed To - Negative Forms Exercises

Used To - Negative Forms Exercises

B1-B2 Level

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Before adding not, decide what you mean. A habit or state that wasn't true in the past needs didn't use to + base verb. Something that feels unfamiliar now needs am/is/are not used to + -ing. If becoming familiar is difficult, use can't get used to.

Check what's already outside the gap. A sentence with I'm already has its form of be; one with never may already be negative. No need to add another negative. Keep the d in never used to, but leave it out after didn't.