CSV should contain columns: email (or customer_email), name (or customer_name), content (or message), phone (optional), created_at (optional)
email,customer_name,content,phone,created_at john@example.com,John Doe,When will my loan be approved?,+1234567890,2024-01-15T10:00:00Z jane@example.com,Jane Smith,How do I update my account information?,+0987654321,2024-01-15T11:00:00Z bob@example.com,Bob Wilson,When will my loan be disbursed?,+1122334455,2024-01-15T12:00:00Z