The verdict in three sentences
Involuntary churn is the most profitable to fight: these subscribers wanted to stay, their payment simply failed or was forgotten. A multichannel dunning sequence (WhatsApp, SMS, email) recovers 30 % of overdue payments at J+1 and climbs to 65 % by J+7, at 15 to 25 FCFA per SMS. The right scenario suspends access after 3–4 reminders with no reply, rather than letting MRR slip away.
The optimal reminder sequence
Each passing day lowers the recovery probability. Here is a proven dunning scenario, as a 2026 order of magnitude.
| Step | Channel | Message | Cumulative recovery |
|---|---|---|---|
| J+0 | Payment failed, retry link | 18 % | |
| J+1 | SMS | Short reminder + link | 30 % |
| J+3 | WhatsApp + email | Reminder + lost benefit | 50 % |
| J+7 | SMS + call | Final notice before suspension | 65 % |
| J+10 | — | Access suspension | — |
The recovery peak plays out in the first 72 hours. Past J+7, the marginal return of an extra reminder falls below 5 %: better to suspend and keep a reactivation channel open.
Channel cost and MRR impact
Dunning is one of the highest-ROI levers: its cost is marginal against the MRR saved. 2026 estimates.
| Channel | Unit cost | Open rate | Click rate |
|---|---|---|---|
| ~10–30 FCFA | 75–90 % | 25–40 % | |
| SMS | 15–25 FCFA | 95 % | 10–20 % |
| ~1–3 FCFA | 20–35 % | 3–8 % | |
| Manual call | ~50–150 FCFA | — | 40–60 % |
For 100 monthly failures at 24,900 FCFA, a full sequence costs about 5,000 to 8,000 FCFA in messages. If it recovers 65 % of overdue payments it saves 65 × 24,900 = 1,618,500 FCFA of MRR — an ROI above 200x.
Mini case study
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Aminata runs scheduling SaaS for hair salons: 400 subscribers at 9,900 FCFA, total monthly churn of 12 % (48 subscribers), 35 of them involuntary. With no reminders she lost 35 × 9,900 = 346,500 FCFA/month. With a J+0 to J+7 sequence recovering 65 %, she saves 23 subscribers (227,700 FCFA/month) for a message cost of about 2,500 FCFA. Over the year that is +2.7M FCFA of preserved MRR.
FAQ
What is the difference between voluntary and involuntary churn?
Voluntary churn is a chosen cancellation; involuntary comes from a failed or forgotten payment. Involuntary often makes up 30 to 40 % of total churn and recovers at 65 % with a good sequence.
How many reminders before suspending?
Three to four reminders spread over 7 to 10 days. Beyond that, marginal recovery falls below 5 %: suspend access while keeping a reactivation message.
Which channel to prioritize in Senegal?
WhatsApp for open rate (75–90 %) and SMS for coverage (95 %). Combine both: SMS reaches those who don't check WhatsApp, at 15 to 25 FCFA per message.
Is dunning worth the cost?
By far. A 5,000–8,000 FCFA sequence can save over 1.5M FCFA of MRR across 100 failures — a return on the order of 200 times the spend.
Let's talk about your project. We automate your multichannel reminders to cut involuntary churn. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
