Cannot cancel a contract with Vodacom!!!

My Vodacom contract expiry date is 1 August. I wanted to cancel my contract, give a months notice, but unfortunately nobody in Vodacom's cancelation department is able to assist me. I even went to the Vodacom shop nearby where I work, and they advised they can't assist, I need to call the cancellations department. I have called 5 times, every time I am told that there is either a technical error on their system and someone will get back to me(they never do), or the person answering the call on the other side say they need to put me through to someone else, and then nothing happens, I hang on for 5-10 minutes, then I am back at the main switchboard. This is clearly a ploy from Vodacom to keep customers from cancelling their contracts. I will have to give this over to ICASA if they do not respond to this complaint.