@AnnabelNew Sorry Annabel it's a horrible situation you're in. If your contract was with the production company then it's they and not the funder that owes you. Check your contract and keep writing to the production company detailing the terms you agreed. You can threaten invoicing for interest on late payment and finally you can threaten legal action. It's possible the company's gone bust but don't give up, keep pressing. Don't be fobbed off by accounts dept, contact the CEO. Good luck.

Thanks Sheryl. My contract was with the production company, but my invoices are all addressed to the funder, including the ones at the start of the project that were paid. I sent them directly to the funder.
I have contacted the CEO of the funder with the email chain, which contains several emails from both the Exec who worked for the funder and the production company from Sept 24 - May 25, assuring me that I would be paid once the audit and final payments were concluded in May 2025.