problem with an account

Hello,

I have a problem since two or three days

I changed the email which identify my account in "user account" section, and
some hour after, I re-changed it to replace the old mail that i removed (yes
it's strange..

But, since this two operations, I simply can't connect to "user account"
section !!! I've a page that saying me that "The email address and password
you typed don't match anything in our database."
But my account still continue to be credited when i send a wu to this
account !!

I don't understand...please help me !!