Vodacom reception

I used to have Vodacom reception at my house. After many complaints a technician came to my house, tested and said Vodacom will issue a booster to me. They called me once to say the boosters were out of stock. Now I cannot reach anyone via the call centre - who just says the department is offline. I have 3 lines I have to upgrade, but now seems that I would need to move to MTN. So frustrated and SO much time wasted on calls