Lack of service

I have called their contact centre multiple times today. I have asked to speak with a supervisor and was told that a supervisor may or may not call me back from one of their remote agents. He was rude and sarcastic and spoke over me. The next agent put me on hold and then transferred me to the rate the service line, suffice to say I rated their service a zero. Another agent left me on hold for 9 minutes before cutting the call on me. I need to speak with a supervisor is that so hard?