Not able to cancel contract!

I am in the process of moving overseas and need to cancel my contract with Vodacom. I have called the *** on numerous occasions over the past week and after holding for more than 20 minutes every single time (I held for over 36 minutes this last time) I have STILL not managed t speak to ANYONE! I have emailed them, sent comments on their webpage but still no response! Would they rather I leave the country without paying up my contract? It seems that way as it is absolutely impossible to get hold of anyone. Hopefully I will be able to speak to someone or cancel my contract before I leave the country. Really pathetic customer service