How compromised am I?

I'm sorry to have to ask this question here as I don't know where else to ask. So there's this dude extorting me and he manage to know my full name, where i go to college, and my sisters name just from messaging him on whatsapp (IOS). Some measures that i take is I deleted my whatsapp acc, pulled out my sim card and destroyed it, switch phone, and got a new card. I don't know this person, and this extortion is the only interaction i have with him. I still keep the phone tho. How compromised am i?

submitted by /u/Samm6666
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from hacking: security in practice https://ift.tt/I3CZQ24

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