I am currently trying to use my roaming services I Vietnam and I get a text saying I am required to have a $5 minimum balance in my account. I top up $10 and within minutes My account automatically buys local data without my permission. I try topping up again on two separate occasions, $10 and $20. THE SAME THING HAPPENS. So I have now spent $40 topping up on data I do not need and am in Vietnam unable to use data I have paid for.
Quick check - are you topping up using your data services or via WiFi? Do ensure that data is switched off so you can manually activate the data package before your handset automatically uses it up.
It will also depend on whether you've set your Happy Prepaid App to automatically purchase data or not. Have you checked the Happy Prepaid App to see if this setting is switched off?
If this doesn't work, please send us your registered name and Prepaid number for verification by clicking the words bracketed by the arrows here > via Private Message < so we can check on this for you.