I've had my cable company call me directly about an account issue and told them I couldn't validate it was them and the person got somewhat irate with my respon

I've had my cable company call me directly about an account issue and told them I couldn't validate it was them and the person got somewhat irate with my response, insisting there was no one I could call to verify them and that it has to be handled on that call. Turns out it was just a sales call (up selling a product) - which probably speaks to the level of talent they hire for that.