Customers who failed a payment then cancelled within 14 days. Coded "voluntary" by the billing system. Fixable with a 24‑hour retry & channel switch — saves before they ever touch the cancel button.
Engagement collapsed before the failure. They were leaving anyway. Aggressive dunning here irritates ex‑customers, costs SMS spend, and contaminates your retry data.
You don't have a value problem. You have a payment infrastructure problem — and you've been spending the budget on the wrong one.