Prepare one question the next person can repeat
For the $8 fee, write the statement date, service, and exact label used by the provider. Ask, “What is this fee for, and will it appear again?” Keep the current statement nearby. There is no need to collect unrelated account information in a note the whole household can see.
Separate the provider's promise from your own plan
A provider might say “We expect to reply by Friday,” or might only say “The review is open.” In the first case Friday is their stated target. In the second case Friday can be your own check date. Label the two differently so another adult does not misrepresent the call.
Make a note short enough to reuse
If the person on the phone cannot give a reply date, choose a household follow-up date and label it as your own. Avoid recording the call or copying unnecessary personal details when a short note will do. Share that note with the adult who will make the next call.
A complete entry could say “April 8, $8 service fee on March bill, reference 42, review open; Jo checks Friday.” Add a dated update to the same note after the next contact. Keep the original phrasing if the provider changes its answer; the sequence may explain why the balance still looks unfamiliar.