[codegeek]

After a certain point, you stop trying to convince them. You start charging them for every change regardless of how silly the change is. Make it clear to them that every change is chargeable/billable and they will stop.

"He agreed with the layout, colors and text content"

How did he agree ? Was it in writing ? Were exact designs done or was it more of a verbal discussion ? With clients like these, you need to be as detailed as possible.

The moment they add a new change, you say "This is a change request and here is the estimate for it: $x and timeline n additional days. Once you confirm, we will proceed"

If you start charging them, they will either keep giving you money or they will stop asking to change things.