Connect on the go data contract issue

I took out a new contract on the 23 April 2019 for 4GB R109 2GB DAY TIME and 2GB NIGHT TIME. To my surprise I am only recieving 1GB day time and 2GB night time. I have been trying to get MTN to provide me with any sort of feedback to why my actual data it not according to my contact. To date I haven't recieved any feedback regarding my problem since my contract started.