Vodacom= *******

In December I ( along with my mom) upgraded one of my contracts and the employee whom helped us told me that everything will be ready within 24 hours and that is when I can start using it within the contract terms. After that month we I got the bill and they had charged me R19000!!! How is it possible that a contract that costs R400 ends up being that amount??? We called and they had told us that the contract only strted that January and not when we were told ( which was the 3rd of December ). So we left ot there and paid off the amount. Now they had blocked all the contract under our names and said we had not pain ( where they even sent a confirmation email and SMS ). And now stating that we owe up to R7000 !!!! Where I read the bill and it only showed R1000 and they can't even tell us why we owe it...... Vodacom is a bunch of ******* amd I hope that anyone whom is reading this will know it and choose to ise a different service provider as they have nilled us R26000 for their own mistake and they can't even give any explanations.