If a user isn't happy, start with a direct conversation on the project page. Most disagreements boil down to scope or clarity and get sorted quickly once both sides are talking.
When that doesn't work
If the conversation isn't going anywhere, or the user won't engage, let us know and we'll step in. We'll review the project history, the deliverables so far, and the messages between you, then work with both sides toward a fair outcome. In some cases we may issue a refund to the user, but we also protect you against unreasonable requests. The goal is a fair call.
The best protection here is writing clear quotes and delivering what you agreed to. Specialists who do that rarely end up in disputes in the first place.