No telephone etiquette and no manners!

Never have I ever been shouted at by an agent nor had the call disconnected in my ear. I work at a contact center and the level of professionalism I have experienced from MBD has been disgusting. The agent would not allow me to speak and was raising her voice at me. The disconnected the call while I was speaking. I called back and the next agent was just as bad. Offering no assistance and saying that there were no Managers or Team Leaders on shift, because its "Festive" What the actual!? Is there no Quality Assurance Team at MBD? How are agents allowed to tarnish the companies name like this???