Does anyone at Vodacom know what the hell they are doing?

I have a contact with Vodacom for a data only sim. I want to migrate to a higher contract. I have spent more than an hour on the phone with no assistance. One person tells me it can be done as long as I wait for different department to phone me back sometime this week. Another person tells me I can only upgrade by 20 Gig not the 200 Gig I want. Yet another person tells me I cannot get the deal advertised on the internet because its for new contracts only (yet it is not stated at anytime on any of the adverts) I even tried cancelling my current contract to take out the new one for the higher amount of data. That could not be sorted either as I will be penalized with a huge amount of money for early cancellation. Is there anyone at Vodacom that does have a clue? I even tried the online chat way. I am frustrated and irritated that a simple thing of moving to a MORE EXPENSIVE contract can be this difficult. The latest story is that that deal can not be given for migration with no explanation as to why not! I have been paying my current contract for almost a year without any problems or one late payment and would like to get a more expensive contract - I wish SOMEONE could just tell me what the hell the problem is and how to get this sorted. Would Vodacom really rather loose a customer than keep one for more money! SERIOUSLY!