Calls dropping non-stop

I have complained 20Nov and again the 20March already about bad delivery of phones on contracts. The devices finally arrived, but unfortunately the problems did not leave... Since the beginning of our contracts, we have complained to Vodacom that our calls drop continuously although we have signal/boosters installed/etc. They send people to test signal at our factory (although I explained the problem is everywhere, not only at our factory) and there was nothing wrong. EVERY CONTRACT on our company account calls are dropping. up to three four times per conversation. It even dropped twice on the day I talked on the phone to the Vodacom technician....I can stand next to another person who is on the vodacom network, but my calls will drop and theirs not. Every 5-10 minutes in our trading office you hear a very frustrating \Hello.... hello... hello... AAAH F#$"<br> <br> I did receive a call now from a technician about re-syncing our lines"