Website hacked..please help!

I run a website for a non for profit organization and I noticed that my site was being redirected to https://grupoferretero.com/22/ . I’ve tried to log in to the back end..www.mydomain.org/wp-login.php and I’m still being redirected to the mentioned site..My domain service is with namecheap, and they have been adamant that it’s not being redirected or it’s infected.I’ve cleaned my browsers on my home lap tops, and work computers, but I’m not having any luck at all..I’m still a novice when it comes to this, so any help would be greatly appreciated!!!