scammers blocked iphone

Hello, my name is Karimov R.

I was selling my wife's Iphone 11PROon the OLX.uz website, a girl contacted me saying that she wants to buy an IPhone, but unfortunately her Icloud does not fit all Iphones and asked me to check. I logged out of my Icloud and entered her Icloud , then she changed the password on her icloud and blocked my phone. Now he asks for money for unlocking, I'm attaching a screenshot.

Please tell me what to do and how to be?

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