You just have to notice your transactions and check your account every week. That way y'll get your money back. No big deal.
Sometimes things are not so simple. A few years back, I noticed on bank statement with Scotiabank in Nassau, Paradise Island branch, there were cash card deductions on a Friday in Santo Domingo, Jamaica and Argentina all on the same day. As it was a Friday, I knew I was in Nassau as I was being paid weekly (very weakly) on the Atlantis Development and had lodged my pay check on the day in question.
The bank said they would investigate on my behalf and get back to me with details and refund within 4 weeks. I heard nothing from them so raised the matter again and was asked to attend the branch for a meeting with someone in Scotia fraud dept, Bahamas.
I thought I had prepared well, but was astounded when they said that having checked, the withdrawals were all made in a 5 hr period on the day, so Santo Domingo, Kingston and in a branch in northern Argentina. The manager of the branch almost fell of the chair when I pulled out some flight variations, from the Bahamas to Jamaica, the Bahamas to Argentina, Santo Doming to Jamaica and Santo Domingo to Argentina, all priced up, with flight routes and timings etc. There was also a map of the Americas conveniently hung on his office wall.
The discussion soon wrapped up when it was proven the shortest travel time to the furthest location was 14 hrs using conventional carriers. The eye language between the two Bahamians was classic ! Oh and I did get refunded !