Different contract, no BIS and still get billed...

OK so I am convinced that Vodacom has been ******** me for years, charging more or less the same amount for data when I had BIS. Here's why I am thinking this. I have downgraded my contract to a Flexi200 for R199 so I get R200 value loaded on my phone monthly with which I buy bundles and use as talk time..... I can not use more than that amount and have to reload if I run out (or at least was discussed when I downgraded) - I ensured that I say I don't need BIS anymore as I took an iPhone with the new contract...... Today I check my invoice and low and behold I am charged for BIS, Data usage and \general services\". Sorry to burst your bubble Vodacom but this can not be I can only use the amount I have on my phone and need to top up if I run out as was explained to me and the reason I took the contract!!!!!!??? Please sort out this invoice and credit my account immediately!!!! OR maybe we should just look at breach of contract on your side and cancel it all together as I did request this just over a month ago after having problems with the phone I was given and the tale I was sold... I am sick and tired of this nonsense!!!"