Getting paid

I don't want to invoke the Freelance isn't Free Act, but essentially I am told that the production company who handles payment has not been paid yet and the job is still in post. The photographer has not been paid either.

It's been about a month and a half and this is a large company where the amount of money is meaningless to them; I'm also trying not to burn any bridges as I'm new to the market.

What do I do here?