Increased my bill and didn't bother to consult with me

<p>I was extremely shocked yesterday when I noticed that my bill has gone up by R250. When I looked at my statement I see that I am being charged R249.42 for 1Gig of Data for 24 months. I have contacted the call centre twice. Both times I was told my number has been migrated and they need to transfer me but the call is cut. I have no idea what that meant but I want to know who the hell gave Vodacom authority to add a 24 month contract to my existing contract. Furthermore R250 for 1GIG of data is when it is being sold for R149 on their app is ****************. I want answers and I want this sorted out. I will have my debit order reversed until such time that this is resolved. I expect an immediate response and resolution!</p>