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KiltedTim is 100% correct. Apple can't help you. We can't help you. You made a VERY bad decision to let someone else sign into your phone. Be advised they will likely try to make you pay a ransom. Don't do it. Once they realize you're willing to pay them, they'll just demand more money.

Go buy a new phone and learn from this bad decision you made.

Sorry. No. Apple can't help you. Never EVER log into your devices with someone else's Apple account.

You have lost control of the device and Apple can not intervene once it has been placed in lost mode.

There has been a dramatic increase in these scams in Russia recently.