Unfairly billed

I spoke to Magdale,about my billing account and the amount of R596,32 went off my account instead of R467.99,I need this to be resolved and I definitely don't want to be credited cause I am being thrown out of my budget due to something that was not my fault and if I'm being credited I will put a stop order on my account if I'm not refunded that extra amount taken off,i want that amount back into my bank account not vodacom account as a credit.