Once again Vodacom disappoints!

Vodacom has disappointed me again, last month i called to change my subscription from airtime to data on 1 of my contracts, the person who helped me change assured me that my monthly subscription fee won't increase instead it will be less with R4 or R5. Last week when i called to cancel insurance on 1 of my devices that's when i noticed that my monthly subscription fee has increased from R600 to R759 without any explanation. The agent who assisted me with canceling the insurance for 1 of my devices said he can't see the new amount i will be paying after canceling the insurance, then he transferred me to another agent who also said she can't tell me how much i will pay after canceling the insurance, she told me to do the calculations on my side. I then told her about the change of amount which i dont understand, she tried assisting for almost an hour (thank you lady for trying to assist, i really appreciate it), after looking for almost an hour she also couldn't solve the issue then she said she will escalate it. I received a call from another agent on Thursday saying the issue is with the insurance, i tried explaining to her what the previous lady and I spoke about earlier this week she was insisting on giving me the insurance department numb saying its their fault. I told her what they agent who deals with insurance said but still she didn't understand. After talking to her for 15minz I told her that I'm at work and can't talk for long, I asked her to call me back after an hour, she said she can't because she will forget because she will be on other calls, she then said i must buzz her on the same number she's calling from. After an hour or hour 30minz i called her and she didn't answer. Today its Saturday and I am still waiting for a call back to solve this issue.