Poor service and fault advertising

I took the 120 GB, sim only contract with MTN just over a week ago. According to the adverti*****t I was due to get R40GB during the day and 80GB night express. The deal came with the added value of an additional 100GB once off. The deal was processed at the Northgate branch, not a very pleasant experience. I went back again to the shop after I discovered that I have zero night express data. I asked about the 100 GB once, no one knows. A logged a query at the store last Wednesday, still no response. I was instead asked for feedback which I reiterated my issue, still no response. Please assist as I’m about to be billed R326.00 on July 1, but I did not get the full service/product that was due to me.

Regards Kedibone