Yahoo Email set to another Language

About five days ago, our business email that we've had for 10+ years was changed from English to Chinese. It is
now set to Qima Yahoo and for the life of us, there is absolutely no way to change it back. I have searched the
internet for hours trying to find a way to change it back to our native language and it seems like Yahoo has made it impossible to do this.We contacted a family member who specializes in computer help and even he was stumped.
If there is anybody out there that knows what to do, please help.
This is the most puzzling problem with the internet or computers for that matter that I have ever encountered.
This wouldn't mean so much if it wasn't for our business that we conduct with clients on there.
To make matters worse, Yahoo has made it impossible for you to reach out for help to them. We are helpless at this point and if there is some genius tech out there that could figure this out, I cannot say how grateful we would be. Our business is depending upon this.