Worst service

I took a contract with vodacom in may I was paying the amount I signed for all of a sudden I receive a call stating that I'll be paying R2060 this month because of an open line which I was never told about ,now the lady that pretended to assist me yesterday I found out she put me on a very expensive option now and I have been calling the they just sending me from pillar to post I am very much angry and frustrated yoh this is the worst service I have every received in my life