Disappearing Airtime

Sometimes when I purchase airtime/data using the Standard Bank cellphone banking app, I get a deduction in my account but no airtime/data credit on my phone recent one being last night where I purchased R29 airtime and I got an sms saying my account has been reduced with R29 but no airtime was loaded in my account.

So Standard Bank, tell me what happens to my purchase? I doubt it is my network error, because I also have apps with FNB and Capitec and it never vanishes, just you. And every time this happens I first get an error message saying the amount I selected is invalid and then immediately I get a bank sms notifying me that my bank balance has been reduced with the selected value.

Super annoyed! Pay back the money!!!!