"Legal action" means you filed a lawsuit. This looks more like someone sent a list of requested changes, backed up by an implicit or explicit threat of legal action.
That's how these things usually (should) go; a good legal system (be it civil suits, insurance claims, mediation, etc) will only actually take on cases if you've tried a reasonable approach first, e.g. asking nicely.
That's how these things usually (should) go; a good legal system (be it civil suits, insurance claims, mediation, etc) will only actually take on cases if you've tried a reasonable approach first, e.g. asking nicely.