Earlier quoted context omitted.
This is where prepaid mastercards which sync up to an app on your phone come in really handy. You get a push notification instantly as soon as a contactless transaction goes through so you know right away if you've been ripped off.
True, but that does not work for TfL because of how they charge you. Details: http://news.revolut.com/post/146212645837/touch-it-tap-it-re... I've been charged a wrong amount by TfL a few times in the past, I contacted them (either on the phone or via the webform) and I was always reimbursed. There are basically two situations where you get charged a wrong amount: 1. common: the "touch out" did not work. Just log in…
Since switching to using my Monzo card, I've had this issue one time and received the refund no problems. Not sure if that's coincidental.