How can i change my data to airtime

I borrowed #7500 worth of airtime from MTN yesterday and I paid back today but the borrowed airtime is not in my account. And while I tried to buy data plan with it yesterday...

I mistakenly buy 35000 data how can I convert my data to cash?

Xtra special data of 4.5gb + 1500 talk airtime and i was not credited but debited my airtime of #1500

I'm having problems with the the airtime sharing, both with your ussd code and on your app. Iv been trying to create a new pin. It just doesn't work: on your app it says it...