This exists, it's called an "advocacy service," and some employers offer access to these services as a benefit to employees. Aon Hewit operates such a service,

This exists, it's called an "advocacy service," and some employers offer access to these services as a benefit to employees. Aon Hewit operates such a service, for example. I recently received a large, surprise medical bill due to an error by the hospital, and the advocacy service did all the legwork/phone calling necessary to get it written off.