Hi Leonard, No, if you are throttled, your voice service is not interrupted. You are able to continue to take and receive calls. If you are able to receive or make calls please send an email to firstname.lastname@example.org.
Exede Voice does not impact your data usage in any way. It is a separate service. The voice interface box comes before your Exede data modem in the line from the dish, so there is no way the data modem can even measure the voice service. Your data modem contains the usage meter that Exede uses to track your usage.