Not getting what we were quoted and paying for!!!

We upgraded our contract earlier in the year. Bongani Mpikanisi from the Clearwater Mall branch offered us an MTN made for business contract @ R459pm which included 400 minutes and 6.5GB of data, to date we have not received what was quoted but we are being charged according to what was quoted, i.e. R 459 but are only getting 200 minutes and 2GB of data. I have queried this on numerous occasions and Bongani told me that they were a number of clients that have complained and that his logged it and escalated it but there has been no resolution. I called 135 and spoke to a lady Mokwana and she said that they were aware of the problem and the MTN consultant needed to send the contracts through to be rectified, his said that his sent it to Kgosiyami a few weeks ago, and still this has not been rectified. I feel MTN is *****ing from my husband and I as we are not getting what we are paying for and what we were promised and has the ordacity to increase tariffs 1 May 2019