Finding a good virtual assistant has worked for many businesses.
It does take time to on-board and like any other activity, there is a broad spectrum of competence.
Other ways to improve your situation is to do an audit of your external communications channels and advertising.
If you can laser target your communication to the right group of people and make sure it is easy to find the info they need, you can both attract more of the right people and deter the wrong people from calling.
Thanks Paul, I already have a virtual assistant but specifically looking for recommendations / insights from anyone who has used a live phone answering service, where they have multiple agents (usually based in Australia sometimes in the Philippines etc) where they can screen calls, take messages, transfer etc to handle our call overflow and stop us missing important calls.
Good point about the messaging etc reduce call volume – I like that idea.