Vodacom not true to there word!!

I was phone by someone representing Vodacom. It was time for my 3x contacts for an upgrade. I was asked about it and was made a decent promise and offer. On two of my contacts(one my own number the other my wife's) I was promised the same......500min & 2.4gigs each for 24months. My 3rd contract(my router line) I was promised 120gigs(70gigs anytime & 50gigs night). Today I found out(more or less 2weeks later), I'm given 600mb per phone/line and have to pay about R100 per line more than agreed upon and my3rd contract is not upgraded. This unexceptable. When it comes to monthl end I must pay or Vodacom cuts me of. But when it comes to promises there is always trouble to what was promised and Vodacom gets away with it. NO INTEGRITY!!!!! No truth in there word!!