"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.
Fun fact: In Germany, the civil courts will usually take the case anyways if it has merit, but the winner ends up paying for the whole lawsuit if they failed to make an effort to resolve the case before suing.