Vodacom rip-off -so called downgrade resulted in higher monthly fees

I phoned to cancel my Smart S contract in Mid May as we were moving to Dubai in August. I received a cancellation quotation of R11,700 which is exorbitant given the device costs were only R7,400 of this. Vodacom's cancellation policy is unreasonable. Hence, I phoned to downgrade my account in July. I explained the situation to the consultant -I wanted the cheapest possible contract given I wouldn't be using the contract just the phone- she advised that the Smart S plus top up contract would be cheaper- said around R450 instead of R520. However, my bill at the end of September was a whopping R678 despite me not using the account. When I phoned on the 5th of October to revert to the Smart S contract- I was shocked to be told they couldn't do this. The consultant said she would get back to me after contacting her Manager- to see if they could grant an exception - I left my Dubai landline and cellphone details- but as usual no response! Really frustrated that I have to waste R330 a month now because of Vodacom's misleading and incorrect advice.