Contract Migration not done...!

On the 25th of February 2016 I contacted the Vodacom Upgrades call centre to upgrade my daughters cellphone contract and change the package to something where it can't run a bill. The reason why I called in was because I was in a Vodacom Shop and they couldn't do the latest promo pricing. She was on a Smart S package, which I requested to be changed to a Uchoose Flexi 200, because in that way I know that there can't be any bill shock. To my surprise my daughter informed me that her cellphone is locked, and she is unable to make any calls or access data network on her phone. The migration was supposed to go through by last day of February which did not happen. I contacted the call centre and after waiting 17minutes to speak to a afrikaans consultant she informed me that there already is a amount on the contract that is due. I am not going to pay for Vodacom's mistake! Its their responsibility to make sure everything is done and not mine as the customer. I want my problem to be fixed and the amount removed from my account that went over due to their negligence!