Dismal failure of service - Vodacom Call Sponsor

Vodacom. I have been using call sponsor for many years and I want to change the numbers I sponsor. I have tried now for three (3) months to get through to your call centre (the only way I believe you can now do this.) the number I am told to dial is ********** 0. I dial the number, the system acknowledges I am registered and then transfers me to 111. Your help centre tells me they do not have the function to assist. All you do is run us around in circles. What terrible and frustrating service.