Separate provider payment from household reimbursement
The provider received one $48 payment. It does not need another because the money came from the wrong pot. Put that receipt with the bill and mark who supplied the money. In the household record add a separate line such as “Household owes Pat for internet payment.”
Recalculate if the charge included a personal item
If $8 of the $48 was Pat's personal add-on, the shared service cost $40. The household can return $40 to Pat from its shared funds, leaving Pat responsible for $8. If there is no separate household fund, calculate reimbursements using the agreed shares rather than assuming the other adult owes the entire $40.
Prevent a second payment
If only part of the bill belongs to the household, agree on that amount before the transfer. Save a reference to the original payment and the correction so the next person reviewing the service sees one bill and one reimbursement.
Check whether an automatic payment is also scheduled before anyone changes it. Use the provider's account record to determine what is still due and follow its instructions if a duplicate charge appears. Once the reimbursement arrives, mark that line settled. It should not add another $40 or $48 to the month's service spending.