MTN SA

I have just took a router contract deal with MTN a month ago. A friendly consultant in Campus Square advises me to take a package of 40 GB day time and 80GB night express at 329 pm. After 12 days my whole data was used up , to my surprise I live alone and I’m at work during the day. On the 12 th my data was topped up and this morning I just couldn’t use my WiFi again since it is used up . I called the outlet and to my surprise only 10 GB was topped up for my night express .. so what happened to my day data ? I am so disappointed in MTN as a whole and would recommend that something is done to ensure that everyone that signs up get the value for what they are paying for. I am waiting for their response on cancellation of my contract.