wrong data credited

I am very disappointed with MTN. I am very upset right now. I purchased MTN data***), dialed *141# and chose mtn menu, purchase, data for 30 days and then chose option 12 (10GB + 10GB), but I only received 10GB. I then phoned MTN call centre, spoke to Xolile Mtshali, she told me that I purchased 10GB and 10GB night express. I did not purchase night express, my data is supposed to be 20GB. I really need this data as I am working from home. I have sent complaint to their complaint department and copied the Supervisor Constance matiwane. They have not responded yet. This is very urgent!!!!!

I bought as per your systems(option 12 for R469), which is 10GB+10GB. it does not say there is a night express.