I bought second hand I phone and required to contact owner to remove the Apple ID and I don’t know him

Sorry, in the situation you describe there is nothing you can do. If a used iOS device has been 'Activation locked' then only the previous owner can unlock it, either by providing you with the account ID and password, or by carrying out the steps detailed in How to remove Activation Lock - Apple Support (as he should have done before selling it).

If you are unable to contact him to do this then I'm afraid you will not be able to use the device - there is no other way of unlocking it at all. Apple cannot unlock it for you, nor find the previous owner for you, and neither can the websites that offer to unlock it for a fee: these are scams.

You should if possible return it to wherever you bought it and ask for a refund as in this event the device is completely useless.

walide193 Said:

"I bought second hand I phone and required to contact owner to remove the Apple ID and I don’t know him"

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Request a Refund:

Seems you've been scammed, though a full-assumption on my part. So, ask the seller for a return.. This is the site they should have used prior to selling it to you: What to do Before you Sell, Give Away, or Trade in your iPhone, iPad, or iPod touch - Apple Support. The seller should have known better.

Learn from This:

Next time you go about purchasing a device from someone, request that they let you log into your own iCloud account on it, prior to handing over the money. If they decide to disabled by those rules you've set forth, then do not proceed with the transaction.

You cannot use the phone. If you can't get your money back, recycle it responsibly.

Read this --> https://discussions.apple.com/docs/DOC-250001038

If you can't contact the owner to remove the activation lock, you are out of luck

Recycle it responsibly or return it for a refund.

Not piling on, but adding one statement I have not seen here ...

Another person reported that they met the seller at the phone store, activated the phone through their new service in the phone store and only then handed over the money when all panned out.

One week later a mysterious carrier/activation lock caught up with the phone from deeper in its past life.

Likely because the rightful owner of the phone asked their carrier to blacklist the phone.

Indeed ... unless Apple or an Authorized Reseller is the source, it could have passed through many hands.