no response from Vodacom

For some months now our staff, our guests, and ourselves cannot use our cell phones using Vodacom either for business, personal or medical emergencies -even if we have signal bars our phones cannot make or receive calls -We have asked vodacom twice if there is a problem in our area( Vivo, Limpopo) and have not had the courtesy of even a response -we have just been ignored -many of our guests claim they are having the same trouble with Vodacom where they come from -is this country wide?