Poor service from Vodacom

I opened a cellular contract last year and as a first time credit user my experiences with them was just poor. Everytime extra charges is added to my account. Few of the online consultants I have been consulting all gave me different answers. They even promised to get back to me and im still waiting. Now, other networks are picking up their mistake and guess what I am too blame for it. I had to settle my account and pay over 500 for penalties. This is by far the worse experience. I am surely not planning to use their service again .