Misleading by sales agent

I received a call from Vodacom and they offered me a contract that will reduce my current payment and I did receive the router and call Vodacom same time and asked them how much I'll be paying just to make sure and I was told they have haven't received invoice I should call this month and boom I received my statement my monthly payment has increased and when I call to ask for cancellation they gave me *** and it's a joke someone answering my calls not saying anything I dropped the call and when calling again I am listing to Vodacom staff having conversation saying nothing to me, Vodacom its a joke serious, I kept on saying hello hello and people are chatting to themselves not me. please come and collect your router or fix the problem. i don't like to deal with *********** people, they sell you something next thing no one wants to take responsibility, i need the name of the person who call me and the manager of that person