unable to reach consultants

I have made several calls to Vodacom cancellations department from my Telkom line today.<br> I was made to wait for more than 20 minutes on each occasion but received no assistance. the charges are normal cellular rates .<br> all I want to do is cancel my existing contract but Vodacom offers no assistance and will eventually run my contract after the 24 month period. this is terribly unfair to the consumer. why should I stay on the line and be charged such high rates in order to notify the company of my intention to cancel my existing contract?