Unfair treatment during verification Vodacom consultant questioned my identity

I app**** for a Vodacom cell phone contract online, they called and I missed their call. I called back to their call center and spoke to Zandile, she asked me security questions then put me on hold. She came back and asked me twice if I am the account holder which I told her I am, she lost me when she told me I am not the account holder and she is not going to help me. I found this very disappointing, It seemed that my identity was questioned simply because of how my voice sounds. If that’s the case, I find it discriminatory and unacceptable. I work in a call center too and I know customers should be verified based on the correct security information, not assumptions about how they sound.