Complaint cohort.
These records are not a statistical sample of all customers or all service experiences.
Reported issue.
A category is the consumer’s selection, not a verified root cause.
Timeliness.
The source flag does not provide an exact company response or resolution duration.
Response outcome.
Explanation and relief categories do not establish customer satisfaction or successful resolution.
Population denominator.
Customer-base size and exposure are unavailable, so counts are not customer-level complaint rates.
Operational cause.
Case histories, repeat contacts and internal process events are needed to explain differences.
Historical context.
This is a US complaint cohort, not a current Nigerian market or company benchmark.
Snapshot changes.
Later API downloads can change as public records are updated. The published model and source hash preserve this study’s scope.