You are likely to have been scammed. Did you provide any potentially damaging information to anyone? If yes, you'll need to follow up, for example, with a credit card company, Apple, your bank, etc.
If you gave you Apple ID password to the scammer, then
Change your Apple ID password https://support.apple.com/en-us/HT201355
Here is what to do after you change your Apple ID or password
https://support.apple.com/en-us/HT204071
Also see If you see apple.com/bill, itunes.com/bill, or an unfamiliar charge on your statement https://support.apple.com/en-us/HT201382
Here is some information on how to "Avoid phishing emails, fake 'virus'
alerts, phony support calls, and other scams:" https://support.apple.com/en-us/HT204759This
read also provides information on how to "report phishing attempts and
other suspicious messages to Apple."
Here is another read that covers scamming. It deals with the App and itunes Stores, but it also has more general applicability https://support.apple.com/en-gb/HT201679