Get a ProAdvisor for an unlisted service: Handling Accounts Receivable

I need an actual person to help with accounts receivable. I mean to do things like:
* contact and follow up with customers who have unpaid invoices
* figure out where payments might have been made but not attributed correctly
* Examine "real" bank deposits to see if there is a clue about which invoice was being paid
* Receive remittance notifications and handle matching
This is basic hands-on accounts receivable stuff where Quickbooks knowledge is needed but is not sufficient. I had hoped that I might be able to find someone in ProAdvisor but this kind of service is not listed.