Unauthorized apple.com/bill charge on my paypal and signed out of my apple id on all devices

I was charged 77.02 to my credit card for something I DID NOT purchase. I can't see what was purchased for this amount on my itunes account. I contacted paypal to file a fraud case and they said I had to contact the merchant (apple) so I did. Apple said it takes 48 hours to get an answer for the unauthorized payment case I filled. I'm still waiting for apple to answer me it's been 24 hours. I'm really worried! Should I cancel my credit card once apple finally answers me? Has anyone experienced this type of fraudulent activity before?