Very poor Customer Service

I am in the UK at the moment. My Cell C SIM card has stopped working. Cell C cant/wont send me a new one so I am trying (since mid June) to cancel my account. No means of phoning the Help Desk from outside of SA, their live-chat appears unmanned and eventually times me out, my numerous emails remain unanswered despite automatic response that guarantees a response within 24 - 48 Hours. Awful service.