MTN poor service

Unhappy MTN client for bad service!!!!!!!!!!

I’m so unhappy on how MTN treated me during #black Friday weekend and I have been a loyal MTN client for years....Here’s a story, Saturday 24 November 2018 I went to Mall of Africa MTN store to apply for a data SIM card since there was #Black Friday special, got there and an application was completed on my name and I was advised that I will receive a text message stating the outcome of my application. Fine I left, later that day I received a text message saying that I was provisionally approved and that an MTN agent was going to contact me, indeed I was contacted by the MTN agent and was advised by the agent that my application was approved and that I must collect the SIM card at the store (Mall of Africa), mind you when I initially app****, I app**** for 80GB for R499 data special, but when I got to the store I was told that I couldn’t get the 80GB option because the system was not allowing it, therefore I’m getting the 20GB for R199 special. My question to MTN is, when I was completing the application why was I not told that I cannot get the 80GB option but rather the 20GB? And why didn’t the agent that contacted me tell me that? Why was I only told this upon me fetching the 80GB SIM card at the store (MTN Mall of Africa)??????MTN has poor service..... I’m super angry and even considering porting to another service provider...I’m asking MTN to look into this matter!!!!!!