Incorrect Upgrade, *********** Consultant and Manager and Unfair Resolution

I upgraded my data contract last month and unfortunately had Nelly Mahlasunyan (not sure if correct spelling) as the consultant who processed my upgrade - INCORRECTLY. On the 1st of July my Anytime data balance was incorrect and not as per the agreed contract. I have been calling Vodacom ever since the 1st of July and staying on hold for hours because apparently only the lady that did my upgrade could fix it but there was no way for me to contact her and I had to wait for her to call me back. To date no one called me back even once to rectify the mistake. On two occasions I managed to speak to Nelly only because I stayed on hold until another consultant got her to call me back while I waited on line. On both occasions she blatantly ****, first about not receiving any emails from fellow consultants to call me back and then (on Tuesday the 7th) she promised to call me back with answers within 24 hours because they needed to get the call recording to prove what I upgraded to. I also asked to speak to her manager but everyone insisted they couldn't share ANY details and the manager would call me back. NO ONE called back. On Friday July 10th after persisting yet again I finally get through to Nelly and refused to put the phone down until I have answers. After almost an hour on hold with no courtesy of her checking that I was still on the line or updating me, she comes back and just says her manager is now listening to the recording (after 10 days of my querying). The call was then abruptly cut with no answers. I had to go through several agents and be on hold for an uncomfortable amount of time yet again before the consultant got her to call me back. Only for to say that her manager listened to the recording and I was right and the SYSTEM processed my upgrade incorrectly! The solution that her and her brilliant manager came up with was to pro-rata the data that they did NOT give me on the 1st of July and only give me the portion that is left for the month apparently because its promotional data!!! How on earth is that fair in any way? First they are *********** and can not process a simple upgrade request, second they make you seem like you are not trustworthy and don't know what you upgraded to. They show no courtesy to call back, are rude and speak blatant lies. Then come up with a "solution" that makes no sense and puts the customer at the disadvantage for their Incompetence and errors! Apparently I will be billed for the full contract amount but not get the full Data benefit that I should have because they made a mistake then took almost two weeks to fix it!!! The thought that I might have to go through all this again next month because they haven't rectified it on their end is daunting! I need feedback and a fair resolution urgently!