How much does JSS cost?

[noirvision]

Hello freelancers!)
At the additional milestone, the client wants to add a job that we did not discuss earlier, and for which he wants to pay half the cost of my price. If I refuse, the client threatens to leave negative feedback.

1. Is it worth it to save JSS to do the job cheaper? Or is it worth it to do the job cheaper to make the client happy?

2. What options will help save my JSS?

Thank you all in advance!

[versailles]

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Val M wrote:

If I refuse, the client threatens to leave negative feedback.

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Report them. This is not allowed.

[noirvision]

Thanks!
Can you tell me where to go or a link to the procedure for such a violation?