[jontas]

It can even be a problem if you do initiate the call. My mom got taken in by a scam where she googled "American Express phone number" and a scammer's website or paid ad (she isn't sure which it was) was showing at the top of the results with the wrong number.

[soco]

Yet another example of the often discussed "Google search results infestation"...

[edmundsauto]

Also possible if they gave malware on the computer, and it modifies search results in the browser. That’s always seemed like a serious vector although I haven’t heard much in the way of in the wild exploits.

[weaksauce]

that's why you only call the number on the back of your card if you can help it. and double check that you entered it correctly