I have my own reasons to deactivate the account. I need to deactivate it for now and reactivate it later. How can I do it? I already tried writing "please delete me" in my about me and also filled up the form for which I was supposed to receive mail but the account is not deleted. Why?
Deleting your account is not the same as deactivating it.
Deletions are basically irreversible. We cannot restore your account for you if you decided to delete it but then changed your mind.
We currently don't have a way to do what you want at all. If you don't want to use your account right now, but think you'll need it again in the future, your best bet is to just walk away and let it sit for a while.
(Note that we have some automated account cleanups, so if you go inactive for too long and meet any of those criteria, your account might get deleted anyway.)
That being said... I don't see any emails from you. I'll have to check to make sure our help form is working properly. But in the meantime, let me know in comments here what you'd like to do - delete your account or keep it.