t i am getting an error that i have no data when i try to connect to the internet

I have data but i get a message that i am getting an error that i have no data when i try to connect to the internet. please note that I could log in until this past Friday when I started experiencing problems. I am in Sundowner, Randburg and it does have LTE coverage

my current balance You have 18GB LTE/LTE-A Anytime Data and 40GB LTE/LTE-A Anytime Data.