Cannot login

When I wanted to play Minecraft, it asked for my login. I entered my username and my password, but kept on saying Invalid Login. I pressed Forgot password to reset my password, and I tried to login with my new password, but it said Invalid Login. Now, sometimes this doesn't do that, but the majority is it does. So, that means I have payed but literally can't play.

On the screenshot the password field is blank, because I just entered a password and complained.