Daily supply teacher cut short by school. Should I still insist that the agency pay me as I contracted with them and not the school.

I’m a cover / supply teacher. I had a contract to work all week at a school with a new agency.

I worked Monday. Tuesday and Wednesday. I even had a goodbye with the head of department last night where I confirmed the classes I was due to teach today. No negative feedback only positive support.

I found out on my journey in (5:30 am wake up) this morning (7am) that they no longer wanted me for the rest of the week. They will be handling cover lessons internally.

This is my only source of income. My contract to work was with the agency not the school. Should I insist that I still get paid??

If I am able to get other work for today and tomorrow should I still insist the agency pay me as my contract to work was with them and not the school, regardless of if I am able to secure other work?