Close Multiple Accounts

I realized few days ago that I posses more than one codechef user id connected with the same account by mistake …Actually I created one of the account last year but didn’t worked …But this year in order to start working I created another id…how do I apply in order to close the previous account

Mail to

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I mailed to them a long time ago …But that account is still active …How can I make them hear my voice?