Bad Customer Service - Annoyed as hell

I called a month or so ago and requested that my current package is not suited for me. I dont use much of the free minutes issued and mainly run out of data. I was told I have to wait for 3 months before any changes can be made. I understood and the consultant was very helpful. I called today to try and change but the call become very ugly and made me feel stupid . I was asked the security questions and could not answer some of them as I was not prepared. I was then told If I dont answer the next question then they would say goodbye. I asked to speak to the manager and was transfered. Whilst on hold I did a seach for my statement and answered the questions. The manager then puts me back to the same consultant that made me feel stupid. I asked her to make me speak with someone else and was told there is nobody and If she transfers me then I would be asked the questions again. This made me feel like you better let me help you whether I like it or not....I hanged up!!! I have never in all the years paying vodacom felt like I must go rather move to a different provider but this experience was not on!!!!