If this truly is Yahoo support then will someone please please help me??

I've sent yahoo about 8 or 9 emails with no response.. I even went so far as to try and find a phone number, to no avail.
So this is my last resort... Here is what happened: Someone I knew sent me a link, I clicked on it and nothing happened.. About 10 minutes later it said that someone signed in under my name and booted me out... Now my password is changed and I can't get to my email.... I have VERY important information in my email that is VERY valuable to me.. Not to mention contacts that I keep in touch with on a weekly basis.
I Don't know what to do.. I have had that nick for roughly 10 years now and have used the email for that long as well... Will someone please help me, or am I just waisting my time???

Nicole