Vodacom *****ing from they loyal customers

I have endless problems with vodacom when u call them to ask to speak to a manager they always in a meeting and when u ask for help then non of the consultants can help you they don't even know they staff that work with them I have called the cancelation department to cancel a number of mine which contract has been up. Then the lady by the name of Kimberly offered me a better package on 2 number of which was R175 a month and I asked her what my bill Wil be for the month she said about 500+when I get my bill for this month it was 1129.98 how is this possible and when I called vodacom yesterday they tell me they don't and the staff doesn't even know who works there when asked to speak to a manager then they tell me they in a meeting. I am tired of vodacom I have had many problems with them and still my problem is not solved. Can someone please help