MTN app

I had logged on to the app to buy a 1GB daily bundle and when I attempted to purchase I had got an error message stating something about the image could not be loaded so when I tried to purchase again I noticed my airtime had got deducted twice and now I have 2x 1GB daily bundle when I had only wanted one. This is scary because the SMS even came through after a few minutes whereas it would normalize be almost instant. Now I am stuck with this and short of airtime because of the stupid app. I do have the latest version of the app before MTN tries to push the blame on the customer