How to deactivate codechef account

Hey, could someone know about how can I deactivate codechef account permanently or restart whole progress of codechef account because I want to start from begining,
I sent a mail to admin but they are not replying.

After deactivation of account, will I able to make account with this username. Because I cant change my username, I loved it.

Only @admin can confirm (answer) this.
I think no you will not be able to take same username.

@ista2000 One more person loving his username.