I am new to freelancing. I have developed a project for a client. I am waiting for the final invoice to be settled - fixed price project. The client has requested revision changes 3 times. By revision changes I mean, I have presented the project to them and they have given me a list of changes to implement (this has occurred 3 times). Now I have been given a 4th list of revision changes.
I'm unsure how to phrase or communicate that I cannot do anymore change till my previous invoice has been paid. Can you provide some advice and/or examples?
Should I/can I simply say; I cannot perform your requested changes until the last invoice has been settled?