Iphone lost and found

My iPhone5s was stolen a month ago.
I could find the details of person using my iPhone using FindmyiPhone.
The thief had sold the phone to a shop.
The shopkeeper somehow managed to hack into my iCloudaccount, turn off find my iPhone, and reset my phone.
I could get hold of the shopguy via police complaint and infbon FindmyiPhone.
Now that I have got my iPhone back, it's logged with unverified iCloud account of the shopguy. I can't remove it or reset my device.
I don't have contact with shopguy anymore and have 0 chance of asking his iCloud password to signout.

Maybe take it to an apple store?

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