I have topped up with my overseas card and it cancelled but I didn’t get my refund yet. $100 was the amount. I contacted in Sydney Central Opal booth and they said it will take 3 days to get the refund. I will wait 3 days. And if I don’t get my money back I will take steps. After getting cancelled I have topped up from the booth in person with my local card, still I can’t see my topped up amount in Opal app.