incorrect information on system

I went to your store in Brooklyn 2 months ago, the consultant advised that as I have an average spend over R800 per month that I would be eligible for a premature upgrade. I logged a request online for someone to call me which they never did. yesterday I returned to the store where I was advised that my average spend is R700 and that I am not eligible for a premature upgrade. yet Vodacom deducts R900+ pm for my one contract and R200 for my other contract. if my average spend is R700 then you should reimburse me for the R200+ pm that you have been deducting. from 1 may you have increased my subscription without my consent as I signed a 24month contract for the initial amount.