Pop up appeared telling me my MacBook was locked

The internet is awash in criminal gangs trying to get any of:

Control over your computer

Your money

access to your computer accounts, bank accounts, or credit card accounts

Advertising on web sites can produce the pop-ups you describe, but they are less common on reputable web sites.

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That phone thing is a completely separate scam. There are more than one criminal gangs at work here. DON'T respond, even to 'remove from list'. For them, if they can't get to you directly, they will settle for knowing your telephone number is 'live', so they can sell it.

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• NEVER provide personally-identifiable information to a caller where YOU did not initiate the call to a known-good number that you look up deliberately. All others ARE scammers, by definition. Apple will never call you like that.

• NEVER click links in emails -- assume they ALWAYS go to scammers.

we got FIVE scammer spam calls that "your apple account is hacked please press 1 for help" in the past few days alone. we usually also get a few a week of "your Microsoft license is expired" [we have never run Windows] and others as well.

Some hackers start by calling every number there is.

That is why "somebody answered!" is worth money to them. If you respond in any way, they sell your number as a "live one".

Other spammers buy the lists of "live ones" to save time.