I had someone make unauthorized purchases on my account, how can I get a refund?

[redacted] May 8 at 4:20 PM
AppleReceipt
APPLE ID
[redacted]BILLED TO: Store Credit

TOTAL
$61.95
DATE
May 08, 2016
ORDER ID
[redacted]
iTunes StoreTYPEPURCHASED FROMPRICE

Someone hacked into my account I did NOT authorize this purchase. How do I get a refund for this?

Please contact Apple regarding this matter. Thank you.