Enraged vodacom customer

I called vodacom more than a year ago to cancel my contract with them and they instead offered me a R110 worth of airtime and 1gig data bundles to retain me as a customer, all this was given a discount to me as I was paying R79.00....I would like to cancel these services and of all the consultants I spoke none told me about a premature cancellation fee, even then when they offered me the services they did not mention it. instead they lead me to believe this was like an add-on and I could cancel it anytime. The consultant I spoke to this morning even confirmed it that because I did not take up a handset with them I could cancel the services. Unfortunately she could not assist with the cancellation because she explained that I would loose all the data and airtime I have on my number. they asked me to rate their services and I complained that my query was not resolved. Then another lady called me to try and resolve my issue and also she does not mention the penalty fee and it's only when I get to transferred to the cancellation department does the consultant tell me all this. I am upset by the fact I am being held hostage by Vodacom. even if I do pay the penalty for the remaining months I will not be getting the services I am paying for. I would like to cancel my 1 contract with them and ultimately the rest will follow, because there's always a reason for why they are not providing me with services (e.g I changed my data contract to the phone 1, the number I thought I was getting was the same 1 I had used on my data contract seeing that I was using the same sim card,. instead I got another number which was previously used by someone. My 8 years old son is using the phone I got, he is receiving sms' and calls for people and shops looking for the person who used to use that number. I called Vodacom about the issue and I was told that I would need to pay extra if I need to change my number. They are ignoring the fact that the inconvenience was caused by them but I need to pay for them again to give me the services they had to give me initially.)