You will probably receive a W2 from your employer, not a 1099. There is a little known form that can be used for W2's not received. I'd suggest going to
Internal Revenue Service and take a look. I used it once for my parents when I did their taxes because the company went belly up.
You can file using that form and amend your return later.
As for disputing, I don't know. At this point, you don't know what your disputing. At least call and write the company that you did not receive your W2. I's probably call them and say I will follow this up with a written certified/registered letter. I always forget the term for things without value.