So, a few weeks ago (June 30th to be exact), I worked at an event for a pretty popular company. It was a one time thing, but I filled out all the tax paper work and whatnot. I still have not received my check. I've already contacted them (last week, they said I should have the check by Friday), still nothing. I sent a follow-up email on Saturday (yes I know - not a business day) asking them to see if the check was cashed (obviously not by me)/if they had the correct address. I still haven't heard from them and I was just looking for suggestions as to what I should do next. I don't think it would be wise to sue as they are a multi-million dollar company, and the amount I am owed is roughly $85 before taxes (not a huge deal, but money is money and I want it if it's mine). Also, I tried to find the number for their accounts-payable department but I did not see it. What do I do?

Edit: typo. i really need to proof-read more carefully.