<prompt> Human: Hi Im using a throwaway here just to protect some personal info so some of the details may be a bit vague as well.Basically, I work as a freelancer and did a job for a major company about two months ago. Ive worked with them previously as well. However, this time around I had recently moved and asked them to resend the check to my new address and to void the old one. Its been about 2 months since then and I still havent received the check that they owe me. Ive since done a couple of additional jobs with them, all the while they have been assuring me that I should be expecting the check any time soon.Ive been in constant communication with them the whole time and have been sending invoices. They have a proprietary system that I have to use to access my account and submit my invoices. Just recently, my account seems to have been disabled and when I called HR they had no account of my name or that Ive worked with them. Basically, the HR people have no clue who I am all of a sudden.I called again today and still got no answers and I have no clue where to turn. I guess I should seek legal help but Im not sure where to start.This is a large, international company that Im not really sure how to approach this. They owe me about a months worth of salary for my work.What should I do? Im planning on going to their head office which is in my city and speak to the HR and demand my check and stay there until I get it but Im curious if there are any other things I should do beforehand.Any ideas or tips would be appreciated and I can provide more info if needed as long as it doesnt have to do much with personal information. I am in the US.  <response>: Call your contact in AP. If they give you the runaround, sue them. 