VODACOM CUSTOMER SERVICE IS A JOKE!

I have been trying for over a year to cancel 3 expired contracts, and this morning, received an e-mail stating that I had requested these to be converted to prepaid. I did NO such thing! Calls to the cancellations number leave you hanging on for ages - on three recent occasions, for over 35 minutes! Why is there no email address for their management that complaints can be directed to them??? I have been a Vodacom customer for 40 years, and their level of service is absolutely NON-EXISTENT! I heve complained via their rating service, but no-one cares enough to respond. Wake up, Vodacom!