ozannie on "Lost my site :("

I'm self-confess "know nothing about WordPress", but a guy I engaged to do a website for me was setting it up in WordPress, demonstrated it (a half finished site) to me, and left me to it and said I need to do the rest, and then advised all his clients he was no longer looking after their websites. (Charming eh!).
Anyway, I found a new host - as he instructed, who is now hosting the site, but can no longer log into it.
Stands to reason I suppose, but as I say, I don't know how to use this.
Would my files still be out there somewhere and how can I retrieve them.
This dude has left me one month behind launch date of a product, with now not even the start of a website, which is not impressive to me at all.
Appreciate any advice at all. Thanks