Does anyone use the dunning module? I am little confused because our ACS contact explained that once a customer is in say level 3 dunning they will get no more emails. This seems like an odd design choice because it would basically stop all future emails until that invoice is paid. EX: Customer is in Dunning level 3 with 1 invoice that's 90 days overdue, but another invoice is generated after the letter gets sent that is 60 days overdue. Apparently no letter or notice gets sent to that customer because that older invoice is still unpaid. I know there is an option to do invoice based dunning, but it seems odd that it just completely stops at the customer level. Is invoice level the more standard way of using it?