Surprise Penalty Fee! Woop woop.

So, I've been with Cell C since I've had a mobile phone and only recently have I been struggling to find a good deal with Cell C to upgrade my phone to. All other network providers give me more benefits and it really grieved me to move over, but I made the decision to do so. I called Cell C twice on different occasions to confirm what my settlement amount was. The gentleman and lady I spoke to respectively indicated that I had a settlement amount of around R1500 and will be paying any additional calls, usage that I incurred during this month. I agreed, and paid it off on the 18th of January 2016. Today, (19 Jan), I get a call saying because I cancelled, I get charged an additional PENALTY FEE of R300. Wow. I spoke to 2 people who never mentioned this and suddenly out of the blue they ask me if I \want to continue with the contract"or pay the penalty fee. Say what? Is this how Cell C plan on keeping their customers? And to think I used to be happy with this network. Can't wait to get out completely!! I feel like saying Cell C should take they fee and shove it up where the sun don't shine"