Phoenix 100mm f3.5 for canon ef,,af stopped working

when i first got the lens it was always a bear to focus and the macro was very touchy, ie the object had to be only at the focus distance to get it in focus( ie no macro from 3 ft away).i could use it to take a normal 100mm shot, the focus worked. after a few month was making a very loud grinding noise when i tried to autofocus. now the auto focus won't work at all, i can't auto or manual focus at 100mm( ie using it like a prime lens) but can manual focus(not auto) at the 1:2 macro( doesn't focus with the 1:1 filter manual or auto ) but only if i am at 16 " ( the focus distance) from the object, otherwise won't focus. i mean not just blurry, you can not tell what the object is at all, just a whitish haze, totally out of focus. .
i bought it in july of 06, think it has a 6 yr warranty but can't find the website to send it in.
thanks very much for any help on how to fix or if anyone has any idea what the web addy is i would much appreciate it. they still are selling product so i don't think they went out of business.