What happens if a repair iphone service tries to blackmail me for giving them a bad review?

What happens if a repair iphone service tries to blackmail me for giving them a bad review? - 1
Added (1). Hello.

I went a business to get my phone fixed and in the end they just messed it up more, so I gave their FB page a bad review. However, in return, the owner threatened to call my parents (I still live with them, i'm 19) and tell them about information they found on my phone. My notifications were off and it was on sleep so there was no way he could accidentally come across anything.

What's the legal status of this? Anything?

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