How can I use my data bouns to browse

I do find it difficult to browse with my MTN network for a a long time now. I subscribed for social media for some weeks now but finding it hard to make use of...

Sme date of 4gb was mistakenly bought.. please I needed it to b converted to normal data

I can't use my mtn to do anything data isn't working can't make or receive call ,is kinda useless in my phone my subscription is about to expire I can't make use of it isn't funny