Trying to spend more money but Vodacom don't want it

I have been attempting to speak to vodacom as I need to BUY MORE SERVICES from them. Unfortunately if you have a business account you MAY NOT SPEAK TO A HUMAN BUT MUST INTERACT VIA EMAIL. I would love to close our accounts but unfortunately they were opened before I arrived. Our Account Manager Nomsa Pukane does not seem to like her job or responding to queries.