15 days left in NP, The manager is rude and asks me to work everyday for 9 hours.

I was actually hardworker, and did my best in the current project, due to notice period and other interviews preparation, couldn't work on 2 tasks, as 20 days were left in my notice period,

But today, My manager is still asking me to work, 15 days left in my notice period. He is asking me to deliver all 10 points of the sprint and go, else mail saying you can't to the client. Till my last day.

Not getting should I drop a mail, or work, he is very rude. Any suggestions please.