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Complaint escalation
Call customer support to escalate a persistent complaint.
What makes this one hard
Escalating in English is a register problem, not a vocabulary one: "I'd like to speak to a supervisor" is a fixed, neutral phrase, and softening it too much makes it sound negotiable. You also have to compress a history you have already told once into about three sentences.
Practice every scenario with a real AI partner
Free to start. The partner reacts in voice, stays in role, and gives feedback on what you said and what you could have said better.