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Hi, thank you for contacting JustAnswer.com. My name is***** will do my best to provide the right answer to your question.
I advise that you try a factory reset of the phone, which will erase whatever the thief put on it, and restore it to a condition that ought to be accessible to you.
If the phone was originally registered to you, then your original Google account ought to authorize OK, with whatever password ***** Google account now has.
(But if you have changed your Google account's password ***** you registered the phone, then try the original password ***** if the current password *****'t work with the phone.)
That's fine then. But, when a phone is first registered, it should record and keep, ultimately, that first registration. After a factory reset, usually, only the original Google account and password ***** get into the phone again. (It suggests that your password ***** known, I regret to say.)
But in any case, use that original password, after a factory reset of the phone of your own, and all ought to be well with the phone.
(And you might want to change your Google account's password, *if* it was the same at the time of the theft, as it is now and as it was at the time of the phone's original regsitration to you.)
Then I don't know that I can help you with that situation, and I have Opted Out, opening the case to other Experts in this category.