I have purchased a 1GB roaming data for 3 days.
However, when I reach the destination, the data doesn't work. Instead, around 16 SGD or so was deducted from my main wallet.
Thereafter, I top up another SGD20 and the same thing happened. Around 5SGD was deducted.
Appreciate if you could help to resolve the matter and let me understand how could I make the data work.
I've edited your post to protect your personal information. Can I check which country are you travelling at currently?