Vodacom incompetence

What does it take for Vodacom to get this account right ,even after 2 or 3 times? Trying 5 months to get some resolve, seems consultants are comfortable with referring me to different departments, I'm so used to this by now. 4 different billing amounts across the latest 4 months. After they changed my account to an internet home bundle, though the Sim is on my phone. Couldn't call for a month. Then they changed it back but at double the cost, another high bill I had to pay. They then changed it to the original cost but removed my airtime. another month without calling. Now I'm being sent from pillar to post, upgrades department, direct sales, I've spoken to everyone. Don't even mention a refund for incorrect billing, never to happen.