How Can I Solve This?

So yesterday I suddenly got logged out from my G@G account and since then I tried to log back in but it says 'account did not exist or wrong password'. I tried to change my password but they just didn't send me the email to do so. Now i'm using G@G from the website version. If you know any solution to this it would help a lot. Thank you.
How Can I Solve This?
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