3G Data Contract

This is my second review. A consultant claimed to have contacted me in this regard but he has most certainly not. Could you please assign someone willing to assist asap?

Original review:

I was contacted by Vodacom offering me a 3G Data contract and we negotiated 10GB + 10GB (Night) data for R299. The first month I received only 5Gb data. Vodacom then rectified the situation after investigating the recorded tapes and that the 10GB + 10GB (Night) data for R299 was agreed upon. This month I was billed roughly R495 for the first month with 10GB + 10GB. This month (November) the contract is back to only 5GB + 5GB. I believe this to be a breach of contract and if this is not rectified soon I will be contacting the ombudsman