complaint

I currently have 3 contracts with Mtn and 1 was due for upgrade. My monthly spend is +-R600 to R700 and then I have to purchase additional data for the month. So I needed to to save costs somewhere. I then decided to upgrade to a blackberry 9720 so I could make use of the bis so I could save on data costs as I use the Internet alot. My husband has been using it on prepaid so it was useful. My issue is that the sales consultant did not advise that bis on contract only allows browsing and certain websites would be blocked. So now I am forced to pay for something that I cannot make use of. I have been a contract customer for many years and now I am having endless issues with this bis. Its just been over a week and the bis has been deactivated on 2 occasions where I had to call the call Centre for assistance. Evrytime I get a response that it has to be on the new package and therefore they have to activate it everytime. Long story short, this bis is just costing me more time and money. I dont want this Bis. Is there a solution to my problem? Can bis be completely removed from this phone or am I now force to pay this without objections? I didnt sign up for this.