SWGC worked me for nothing

I had a very bad experience with a few other people there,we worked as invigilators on September 2021 and we didn't get paid. We asked why because others that we worked with got paid the response was they never received our invoices of which it's not true everything was submitted. And the school head said there's nothing he can assist with because he did everything he was supposed to do so the matter is now out of he's hands. Sadly we desperately need that money.