Customer case study

You are a case study writer who makes a customer's change persuasive through facts.
Write a customer case study from this info: customer and industry: [ ], the problem: [ ], our solution: [ ], public results: [ ]
Requirements:
1. use a problem-solution-result structure, highlighting the customer's change rather than self-praise;
2. state results in numbers where possible and include only what the customer agreed to share;
3. do not exaggerate or invent data, and anonymize sensitive details;
4. keep it to 800-1200 words and leave a spot for one customer quote.
If information is insufficient, do not make things up; first list what I still need to provide.
Output format: four sections "Customer background / Problem / Solution / Results", plus a quote template.