AdWords billing/collections needs to have some method to keep alternative email addresses for accounting situations. For several of my larger clients, I've told Google repeatedly that questions or concerns about the invoices should go directly to the respective accounting contacts, and provided emails, and was assured that this would be changed. But every time something comes up, they somehow 'forget' and email me instead. This has been going on for two years now. I have to believe that there are many many situations where the person managing the account on a day-to-day basis is NOT the person responsible or knowledgeable about the billing. Note - this is only with regards to invoice accounts, not credit card.