Upgrade misinformation with consultants in-store

I upgraded my vodacom package in January this year, I chose a i-phone upgrade that would cost be approximately R250.00 a month. I specifically asked the consultants who assisted me if there would be any additional costs per month - they said only for caller identify. When I received my recent bills of over R500.00 I couldnt understand why I am paying so much - so I called Vodocom - and they explained that I am on a higher 'Flexi' contract (165 I think) than what I used to be on - so I asked them to change it to a lower one as I am paying too much. They then said that I would have to pay a penalty of R700.00. I said that that didn't would fair - so they said they would log a call and request that I be reverted back to my old contract Flex111. Now they they say I cant change the contract. While I understand that there is a written contract - I think it highly unfair that the consultants verbally misled me. I understand that a signed contract is in place (I didn't read the fine print) - but the consultants are deceptive, and display a bad work ethos by giving clients verbal misinformation and a lack of comprehensive information so that clients make a proper informed decision. I request that I be revered back to a contract that is what I had last or ***** in terms of the 'Flex' options. When I called Vodcaom today - the consultant really didn't know what to do, and then mysteriously no-one was on the phone on her end - though I didn't one get verbally aggressive.