Okay, this may help some but not all...
I had received 2 purchases on the same day for the amount of $169.49 each and it appeared to be from itunes.
A very long story but here are the key points:
I sent itunes an email and they confirmed I had not made these purchases on my account with them.
So, I called visa...
I had previously had a visa gold card about 5 months ago. I upgraded the card and that visa gold one went inactive.
I was issued a new card and had been using it for several months. Then these 2 charges appeared from itunes. So, I called Visa and they cancelled my card and credited my account. A few days later the charges had been reapplied to my visa account.
It turns out that the old visa gold card had been compromised and not the one I had upgraded to. So, visa explained that although the card had been inactive that's the one that had been used for the fraudulent purchases.
Visa will credit my account but it just takes a little longer as they have to make the fraud claim for the proper visa number that was used.
Just an FYI - it may be useful