Vodacom Upgrade Issues (AGAIN)

I app**** for a Vodacom upgrade deal that was supposed to come with 2GB data and some airtime a month for 24 months, starting from 1st July. That day arrived and my data balance was 0. After multiple calls and following up, eventually I received 1GB of data....I called again multiple times saying that it was supposed to come with 2GB. The last consultant proceeded to tell me that my 2GB will only be received 1st August and they have no means to allocate me 2GB of data (or pro-rata, or a discount, or additional airtime) for July!? She couldn't understand that it is a problem if I'm paying for 2GB and only received 1GB because it was part of an upgrade deal and that makes it "OK". This isn't the first upgrade issue I've had with them and 2 years ago I went through very similar frustrations. Vodacom need to sort their upgrade department out.