Vodacom annoying and unresponsive

Since purchasing a Vodacom SIM card as my second SIM in my new dual-SIM cell phone, I have received numerous SMSs and calls regarding special offers and other sales promotions - but I DO NOT WANT these communications.

My primary cell provider is Telkom (with whom I am generally happy), and Vodacom cannot match Telkom's prices for the service I require. Contacting Vodacom to ask them to remove me from their sales & marketing lists is, however, impossible, as their TOBi service does not provide for such an option. Additionally, when one sends an Email to Vodacom's client care centre, one receives an automated response referring one back to TOBi.

I am glad that I'm not a regular Vodacom customer!!