Suspended account restarted invoicing on it's own

[bear]

I have  one client on a monthly subscription that asked to suspend the account for a 6 months while they considered if they wanted to keep it. Obliged them, suspending the account and canceling the current invoice. About 3 months in, it issued an invoice. Canceled that, made sure the account was still suspended (it was). A few days ago it happened again, restarting the recurring invoicing on it's own, and I haven't been able to puzzle out why. The actual account remains suspended.

Any thoughts on why a suspended account would begin issuing invoices automatically like that?

[brian!]

if you can remember, what was the next due date on the service ??

[bear]

It was monthly, so each month. For several months nothing, then suddenly it restarted billing. Canceled again, once again it started back up. 
Due date shown in the account is October 2, it started an invoice on October 20. 
Puzzling. 

[bear]

Hmm, likely this:

Quote

With Continuous Invoice Generation enabled, any product that is Active, or Suspended will continue to invoice regardless of the status of its previous invoice(s).

Doesn't explain why it skips several months each time, but that likely is causing it. 
Why a suspended account would still be invoiced is puzzling, though. I guess to allow for someone to bring it up to date?

Edited October 29, 2019 by bear

[brian!]

the reason why I asked about due date was because WHMCS invoices continuously (assuming that feature is enabled) - including suspended services...

https://docs.whmcs.com/Invoicing_Setup#Continuous_Invoice_Generation

Quote

With Continuous Invoice Generation enabled, any product that is Active, or Suspended will continue to invoice regardless of the status of its previous invoice(s). Pending, Completed, Cancelled or Terminated services will not generate invoices.

if I were you, i'd throw that next due date forward a few months - and that should prevent WHMCS from generating invoices until it hits that due date.