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Thank you for posting in the community! I'm sorry to hear that there was a mistake at the time of signup.
If you have created an account using the wrong country, the account will have to be closed and a new account created using the correct country. It is not possible to change the country after the account has been created. Once you have closed the account, wait a few minutes for the change to propagate in the system, and your email address will become available for use with a new account.
I hope this helps!