VODACOM HAS WORST SERVICE EVER

I have been trying now for over a month to downgrade my contract. I have emailed the forms to ********** called the call center where they tell me i must speak to Masakane Simon Mabuse but you can never get hold of him and have also been to the walk in customer care at Vodaworld with absolutely no joy. And to top it all, every week I have many dropped calls only to get an sms from Vodacom admitting this. How many years have you been operating now? FIX IT! WHERE TO FROM HERE? HOW DIFFICULT CAN IT BE?