Bad client service at vodacom

I'm have a contract with vodacom and they just decided to block my line out of the blue. I made multiple attempts to get them to open my number but all to no avail. My case is to be handled by their ***** department but there's no response from that department, apparently there's only one person working in their ***** department, as i was told by one of the consultants who was assisting me. How can such a big company have only one person working in a department, what happens when she's sick? My account is paid and up to date but now I can't use the service that I pay for. Vodacom doesn't care about their clients at all