VODACOM ***** BANK ACCOUNT

I have been with VODACOM for under 6 months, I am not excessive on my phone and mostly on WiFi. Over the past few months my bill has been around R3000 to which I put a limit on R2600 (which I never thought I would come close to) yet they still go over the amount, I have spoken to about 12 people from customer care and constantly get disconnected in which I can't get back through to the same person, I will leave VODACOM and never recommend them to anyone as no one can help me. They are useless and I can't keep explaining my story over and over again to people who don't get back to me. I have been constantly miscommunicated with and my bill keep going sky high. Today I even bought a extra 1GB of data for my phone and when I checked on my VODACOM app it says I have 400MB and I was on WiFi. VODACOM is *****ing my money and I want it back, I will go through what ever extremes I need to to make sure this is corrected and that I am reimbursed on the money they have ****** from my account as It is impossible to have my account so high.