wrong info on data usage for blackberry

I bought a Blackberry Z3 and went to the Vodacom shop to do the SIM swap and assistance on how the phone works. I specifically asked if the BIS is working on this phone and got the response that all stays the same. From the Saturday to the Monday my bill increased from R200 to over R600. I then 082111 who also confirmed my BIS is active and in order but I shouldn't use my browser as certain sites not included on BIS like you tube.I phoned again and spoke to a gentlemen who then informed me that BIS doesn't work on the Z3 and said I can go to the vodacom shop for help on buying data. I went back to the same person I did on Saturday and asked him why he didn't tell me about the BIS and the data bundle.He then said its not his mistake as the person who sold me the phone should have informed me, I asked him for recurring bundle to be added to my account and my bbm still need to work. He said he activated it. I then left the shop only to find out its still not done. I went back and Leon then assisted me to set up the Bbm text and ensure that the bundle goes off monthly. Firstly I wasn't informed properly even after asking, and now I sit with a huge bill. Not fair