I have had a fraudulant transaction on my amex card and I have no idea how it happend. I am UK based and have never been to mexico. However this afternoon I had a 100 mex peso transaction notification on my amex app. so I called the fraud line, in that time the card was used 3 more times for the same amount in mexico, they have cancelled the card
also about a week ago I had a $300 dollar nija purchase on my sccount where money was taken but refunded straight away. when I spoke to amex they said not to worry as it was liklrey a typo.
question is how has this happend and what can I do to protect myself?
should i replace my other cards too?