Website Hacked! Please Help!

I have a website called ofindianorigin.co.uk. I have been running it for over 2 years and now it has been hacked.

I cannot access the backend through wp-admin at all. Everytime I put in my user name and password, the page refreshes to show the log in page again! Also, when I press the “forgot password” link, I am asked for my email id and when I put in that I get “There is no user registered with that email address.”

Through the documentation, I have managed to change the keys in the wp-config file but it did not help. I think there is a redirect code that has been added by the hacker hence the wp-admin page keeps coming back.

Can someone please help me? I have contacted a lot of tech guys in India but there is no one here with sufficient knowledge on resolving such issues. Can someone really help please??!!