Billing Issues - reduced seats not regarded in the next billing cycle

Dear Community, I have been trying to get some explanations to why the seats reduced during previous billing cycle was not considered for invoice for this cycle. The response from support has not been very helpful, as it is going in circles with bot creating new case and asking for same info again and again. In Business Plan, from what I understand, if members are removed during a billing cycle, the seat count should automatically be adjusted to the reduced baseline during the next billing cycle (screenshot of a helpdesk article), which did not happen. Do any of you have a different understanding to this seat reduction process? Is there some kind of hidden restrictions that the members needs to be removed “x” days (or “x” hours) before the next billing cycle for the adjustment to take place? Can provide a more detailed timeline and support case numbers if necessary. Thanks.