Vodapay masterpass prepaid electricity problens

I've used the vodapay masterpass app to purchase prepaid electricity for about 2.5 years. The payment and receipt of payment on the app works well, but the receipt of the tokens always late on the app. You do receive via sms. Except the last 2 weeks. 29 sep and today 4 oct, on the app purchased, and receipt of purchase received. No tokens, had to call in to call centre. It defeats the object of convenience, just causes frustration. Same answers of system problems. If your system isn't working, notify your customer before they spend the money.