Yes someone is trying to scam you. Apple does not make such calls. 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.
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If you gave yout Apple ID password to the scammer, then
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Change your Apple ID password https://support.apple.com/en-us/HT201355
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Here is what to do after you change your Apple ID or password
https://support.apple.com/en-us/HT204071
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And, here is some information on how to "Avoid phishing emails, fake 'virus'
alerts, phony support calls, and other scams:"Â https://support.apple.com/en-us/HT204759This
read also provides information on how to "report phishing attempts and
other suspicious messages to Apple."
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Here
is another read that covers scamming. It deals with the App and itunes Stores,
but it has  more general applicability https://support.apple.com/en-gb/HT201679