Upgrading & BIS problem

My wife renewed her contract with Vodacom last month 1 March. She went to our local store in Louis Trichardt to do the transaction. Since she had a Blackberry and was very happy with the BIS service she got in the two years she wanted to stay with Blackberry in order to get the BIS service. She made sure, with the lady who helped her with the transaction, that the phone she choose will still provide her with BIS. She got her new phone on the same day (1st March) and then all of a sudden on the 15th of March she received a sms that her BIS will be deactivated, and so our trouble started! Its now been almost a month after so many calls to vodacom and vissits to our store to correct the problem that she still dont have BIS. She had to buy data bundles due to the fact that she couldnt use her BIS. Last week Wednesday when she talked to the call centre, they said that the request has been logged for the technical team to activate it. Now a week has passed and another two calls to the call centre and still its not fixed and no one has contacted her to offer help or to fix the problem. We are SO sick and tired of this bad service from one of our country's top service provider.