Unauthorized business contract upgrade

I have a Vodacom business account and have had the worst experience. I went into a Vodacom store to upgrade the contract, only to be told that my contract was upgraded some time ago and I cannot upgrade now. Apparently the upgrade was done telephonically. Now this was not authorized by myself and I was never informed about an upgrade. So I contact the customer care for reversals, only to be told that I need to contact the third party who authorized the upgrade and they will investigate. I am NOT a customer of this third party, I am Vodacom's customer and they should be the ones sorting it out on my behalf and not sending me everywhere to do their admin. Anyway, I contact the third party and wait 11 days for a one liner response still giving me no information whatsoever. Vodacom, is this how you treat your business clients? (Yes we pay more for this service to be a business client!), or any client for that matter? This is completely unacceptable that Vodacom doesn't take any responsibility for these sales people doing what they want with your contract. And I will just add that the sales calls from Vodacom are extremely spammy, they don't leave you alone!