New customer first ordeal

I received a call from Elite....vodacom with an offer I accepted. On Friday I received an SMS that my email address has been changed....itemized billing and invoice has been sent and to contact customer care if I didn't request for this change.......wow....what a struggle! Security checks on security checks but so easy it was for a third party to change my details. Now the actual account holder struggle to get service! I can not believe this.