My email no longer exists in WordPress system, so I can’t log in

When I tried logging in 3 weeks ago, it said I had the wrong password. So I clicked on the link to email me a new password. When I enternd my email, it then said that my email was not in their system. so I tried every password I could think of and got nowhere. It has now been 3 weeks and nothing. My blog is still the way I left it but I cant blog or post anything. I have loged into my cpanel and everything is the same there. I use my blog for my business and paid almost $300 for my templet and intallations. I need this fixed ASAP.
If anyone can help me thank you,

Danielle Patton