I don’t understand?

I work a zero hours contract.

Every now and then, I’ve worked a few hours extra (at no cost) - as a goodwill gesture.

I recently stop doing this, as I need my spare time to myself and cos of poor health.
The client phoned the agency complaining and saying that he wants me to resume working for free on weekends, but at no cost to himself, given the past. He is adamant about this, and has been screaming at everyone involved about it.

I don’t understand the logic, do you?
I don’t understand?
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