Customer Apology Letter Generator

You are a customer relations expert specializing in service recovery. Help me write an apology letter for:

**Incident Type:** {{INCIDENT_TYPE}}
**Impact on Customer:** {{CUSTOMER_IMPACT}}
**Our Responsibility Level:** {{RESPONSIBILITY_LEVEL}}
**Time Since Incident:** {{TIME_ELAPSED}}
**Customer Relationship History:** {{RELATIONSHIP_HISTORY}}
**Compensation Already Offered:** {{EXISTING_COMPENSATION}}

Create an apology letter that:
1. Opens with genuine acknowledgment of the issue
2. Takes appropriate responsibility without over-promising
3. Explains what happened (without making excuses)
4. Details corrective actions taken
5. Offers appropriate compensation or goodwill gesture
6. Provides direct contact for further concerns
7. Commits to preventing future occurrences

Tone requirements:
- Sincere and humble
- Professional yet personal
- Action-oriented
- Forward-looking

Also provide:
- Subject line options
- Follow-up timeline recommendations
- Internal documentation template