Mr Price mobile misleading customers

So, last week Thursday I received a call from Mr price mobile offering me a contract deal due to the fact that I purchase so much data using my account, to which I agreed. The SIM card was then delivered on Wednesday, I inserted in on my phone on Thursday. The package cost R119.00 for a R100 worth of airtime and 1GB of data, but to my surprise the SIM only had R87 airtime. I called them immediately after noticing this and the consultant told me that it was due to fact that the SIM had not been inserted on the 1st day of the month and yet I was still expected to pay the full amount, I also found out that the SIM only be recharged using cell C and Mr P mobile airtime, which I repeatedly asked during the call and I was advised that I would carry on with the network that I have been using. After the call I tried to log on to the internet and the airtime was gone, I then tried to call them back and my calls weren't going through. I decided to go call from the store, the consultant who took my call, who goes by the name is Zama, was very impatient, kept asking me to repeat the same thing over and over again simply because she wasn't interested as I was explaining my situation...only when I started raising my voice did she pay attention. I asked if I could cancel the contract and she advised me that because I had used the airtime cancellation would cost R350, which I do not understand because it is not my fault that I was given the wrong information just to get me to take up the offer and was never advised that the data in not preloaded. This is by far the worst service I have ever received...I personally feel that they give all this false information during their calls to get us to take their stupid offer knowing full well that they'd makes a lot of money from all the cancellations!