I was on a plan with 300mb of data. I was under the impression that if i was over my plan and changed it before the end of my billing cycle to the 500mb plan I would avoid being charged for the additional usage and would be billed for the 500mb plan? I was charged an additional 10$ for going over 143mb over my 300mb plan. Is this normal? Did I misunderstand what the sales person at the koodo kiosk told me? I was certain he told me to keep an eye on my data and I could change my plan to a larger plan before the end of the bill cycle to avoid getting charged extra?