Pathetic farudulent service from Vodacom

. I migrated to red advantage on 01/08/2015.i used the package and then on 1/09/2015 I was migrated to a flexi u choose 500.i was not informed and only realised when I had used up all my airtime.it took repeated phone calls and hours of my time for them to tell me it is a system error and there is nothing they can do and I will have to await migration on the 1?10/2015.during this time I made it very clear that I was not prepared to pay for anything used in the month as not only was it a breach of contract but no one had actually informed me off the package that was erroneously added. I was promised my account would be credited.subsequently I have received an invoice that shows that I was billed R 1500 for a migration fee that was not my choice!!the credit that I was then promised is allocated to an erroneous migration fee!!! I am now billed 580 for a flexi uchoose . there is no contract between Vodacom and myself to allow Vodacom to bill me for that.if it was a Vodacom system error then claim it from insurance. not me !! I have no notice of the charge. if You gave a package of airtime in error how is that the clients fault and what legal right do u have to take the money