If you are pretty sure that you are typing the correct password then there may be some problem with the keyboard. Try typing your password in notepad or any text editor and it types exactly what you are typing. There may be any letter missing or you have your CAPS Lock on by mistake.
Do not login 3 times simultaneously as it will get your account blocked.
Also, try to login after 15-30 minutes. Hope it helps. Other wise try reaching you nearest branch for password reset.