[HELP] Buyer added deliverables after gig start

I booked a gig for 6 script reads as a spokesperson and the buyer specified 6 scripts 1m - 1.5 min each. I confirmed with them the word count in the gig.

Then they sent me two docs. One with 6 scripts as specified (1250 words). The 2nd doc was all hooks to read...15 hooks with a 600 word count total.

They hadn't mentioned this at all and expect me to include it for free and says he does this all the time and I'm the first one who has ever had issues. Now I know he'll prob leave me a bad review bc I'm refusing to give him the 2nd doc.

(I would typically charge $ 50 per hook so this is a huge freebie he is demanding).

What recourse do I have that will affect me the least?