Well, first of all I need to know if you are working with a team or totally alone, because you can hire people who speak those languages since learning a foreing language demands great time. Not necessarily has to be one person per language. there are pleople who speak 2, 3 and more languages and you also have to consider how regularly you receive calls with certain language and make that a worthwhile hiring. About the toll calls, you can make contact some telecommunication companies, some have great international plans for business or you just can simply keep using the tools you have been so far since are still working just fine for you.