Unacceptable

I have a red advantage contract with Vodacom. I have had it now for two months and already am experiencing billing problems. Firstly I was told that if a month ends and I have excess data or minutes they will carry over to the following month and that hasn't happened. I was charged more than the agreed amount the explaination I got was that I had sent Smses to an international number which I don't recall doing. Yesterday I was left with 320mb of data as well as 300+ minutes on my phone. When I walk up this morning, my data was gone and my minutes were reduced to a 170+ extra instead of the 300+ I had left last night. I called the red advantage where one is promised top customer service. The consultant Zuko was helping me, he logged a complaint on the Smses. But when I queried the minutes and the date he gave me some soap story about me making calls last night which I didn't, and to make matters worse I don't have those calls he told me about on the log of my phone. Upon further investigation he Said he had sent a call log on email which he didn't. He put me on hold until when he returned he acted as if he couldn't hear me. And finally I was cut off and he didn't call back. Help