********** Vodacom migration upgrade. Shocking handling of the issue

I was called to by a sales person who told me that the contract I was on was on a old system and they need to migrate me to a new system. They said there would be no cost involved and that I would be moved from a 220 package to a 550 package. No cost involved. I said yes and confirmed again that this would not cost anything more. The lady confirmed. This morning end my bill was almost R400 more. I disputed the issue and paid the bill as to not get behind. I just got a message to say that the issue was resolved. Nobody bothered to resolve the issue. Everything is on a recording. The sales person should be fired for misleading and committing *****. Vodacom should change the migration back if they can't deliver on the promises made and refund me my money. Absolutely disgusting.