iTunes purchases on my visa that I didn't order

I've had purchase charges on my visa from what looks like iTunes that I didn't order. It shows up on my bill as APL*ITUNES.COM/BILL 800-676-2775 I called the number to only get a message saying go to ITUNES.COM/BILL. I wasn't sure if it was legit or not. Have I walked into a phishing scam or malware on my phone? I checked my recent purchases on iTunes and there was nothing there that was out of order so I'm guessing its a scam. Just wondering if they could have put something on my phone when I called them. Anyone else have this happen?