Purchasing Airtime via FNB App

I was low on Airtime and purchased some via your App - I did not get an indication that the process could take up to 12 hours before I can get my airtime, If I did I would not have gone ahead with this. After 30 minutes of waiting patiently I decided to log into my Capitec App and purchased Airtime, which I got within 10 minutes. I went to a FNB Branch to find out why I still haven't gotten my Airtime and was told to phone the FNB App Call Centre. When I got through I only then discovered that the process of purchasing airtime would result in waiting up to 12 hours long (unacceptable). On top of having to wait for my airtime from FNB, purchasing additional airtime from another source, I then realised that your FNB App Call Centre costs me airtime... Why should I be charged for your negligence? Your App should have indicated that the process of me getting airtime would take up to 12 hours long. All of this could have been avoided if your App displayed a "heads up" notification. I want to be reimbursed for the airtime that was taken from me due to your negligence and for you to update your App so that all users can be aware of the ridiculous waiting period on getting airtime.

I look forward to your feedback and results.