Wrongful migration & misinformation

Please assist, I was misinformed and wrongfully migrated on my Vodacom contract. The lady who called me never disclosed the correct installment instead she told me a lower amount and told me is the amount to be debited. I couldn't have accepted because I cannot afford it & prior to that I wanted to cancel the contract due to financial strain. Now my debit amount increased from R475 to R664 which I can't afford and was never disclosed to me. So disappointed in the Vodacom Consultant for taking advantage of me.