Data is like butter, eggs, flour and sugar is to French cuisine. Individual parts that are whisked together and baked with a Python package and transformed into a classic French fact toast.
We then sell or consume this fact toast for money. This act of selling in turn is like a Serrano pepper is to Mexican cuisine...
But I digress. Let's look at you internet issue: is the power on?
Sounds like you bought one of those bundles that only work for Skype, WebEx, Google Hangouts, Zoom, MS Teams and Google classroom. If you look on the MTN app, it's stated there. See if you can use any of these apps?