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i asked them to send an email to the email address associated with my account and tgey will find it out, becouse they are not going to get back reply from that email as its been stolen.
Do you really think that not receiving an answer to an email can confirm your identity in any way?
i invited them to a video call even, if they have any doubt i will clear it.
There is no proof that this account ever belonged to you, so it's not a question of doubt, but that without proof there is no case.