It is also possible that your provided email is mis-spelled or so. If you used promo code here you might PM the one you used promo code and tell him/her when you register and what is your surname name and last name. He might able to help you check your login name because login name is usually lastname's first 3 char + lastname first 3 char + a serial number (John White => johwhi or johwhi1 or johwhi2 or so). He may check what number you get.
You can also contact support, maybe forwarding your paypal/google checkout receipt for their verification.
Wish you can solve the problem soom.
FULL_97_OFF <-CLICK = host 1 yr for $22.4