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Not sure how but the first thing i noticed was that my load-outs were changed (i usually dont close the game on my tablet cause this game is the only reason i use it thats why i didnt need to login) and then i tried to login to my Activision account on their website to change the password just in case and the website said my email address isnt linked to an account.
Heya, sorry to hear this all happened. Just to clarify what you said through a couple of comments here, you are still able to login in-game fine but you are seeing clear signs of tampering and your ATVI account (which you use as your login) is no longer accessible? For your account, did you get any kind of password reset email notification from someone attempting to do that?
Regardless, if it is your ATVI account that was lost you should be able to recover it but you'll have to go through our Player Support channels so they can verify all of that and look into the details. Have you tried reaching out to them already and through what channels?