I had similar issue during TNG reload back in July 31, it failed but my card got charged Rm98 instead to some random website called greasymind.com. Had to call bank to dispute the charge and stopped my bank card.

Posted to ask on TnG ewallet thread but received near-no response (post #13797)

Only used TnG (didn’t use any other ewallet apps) and didn’t saved any card info because I wanted to avoid problems like this. Suspected something is wrong with TnG servers or their app itself.