Stop dropping my call

I just called the vodacom *** and selected the contract cancellation side. Agent asked for my vodacom nunber and I told her I don't know it but its tje one I'm using. She insisted I confirm it and asked her I will have to log onto the App to check it because I do not know it. She responded with no problem then while awaiting for thw App to load ahe thwn disconnected my call. She knew exactly what she was doing by insisting on me confirming the number when there's plenty other security questions she could've aske. Why when I call the systems asks me to select # if I'm calling from the Vodacom number then insist on me confirming it. I still want to cancel. Your agents can drop my calls all they want to protect their month end targets but I want to cancel. Who know a contract number by head?????