On 22 July 2015, Abbas Araghchi, Iran’s deputy foreign minister who led the negotiations, made an announcement on state-controlled television that the recently reached nuclear deal with the world powers did not include limitations on Iran’s weapons capabilities or missile power...
While still an interesting point of conflict between the United States and Iran, it's irrelevant because the deal's primary purpose was to prevent Iran from developing nuclear weapons, and by official counts it was doing just that.
In a speech the following Saturday, Iran’s Supreme Leader Ayatollah Ali Khamenei added, "Our policy will not change with regards to the arrogant US government."
What policy was that, exactly? You've provided absolutely no context whatsoever. Assuming it means continuing to develop ballistic missiles, that point has already addressed: it was not addressed by the JCPOA because it's entirely different issue. And we can debate the morality of ballistic missile programs, but it would be extremely hypocritical to suggest Iran is in the wrong for having such a problem when any advanced nation on earth does too, and it's extremely misguided to conflate that with a nuclear program.
Iran never planned on following the agreement.
Yet they were by expert accounts, including the highest authority in the land, the International Atomic Energy Agency (IAEA) even up until a point after Trump announced that the U.S. was going to abide by the deal.
Which, by the way, was never ratified or even voted on by Congress.
We can debate the domestic political side of the things (if you want my opinion, there are deeper problems like the fact that an agreement that effects the entire globe has as it's arbiter a group of politicians elected by people who face little consequence and even less concern for the region it primarily effects), but the fact remains that according to multiple international experts on the topic, the agreement was effectively doing what it was meant to do: maintain a framework to keep Iran from developing nuclear weapons.