Musk posted a series of angry tweets Monday, directing his rage at Apple and its CEO, Tim Cook, over their treatment of the social media giant, which Elon recently purchased. But, Apple showed no interest in engaging with the billionaire.

Right from the start, Musk seemed annoyed ... "Apple has mostly stopped advertising on Twitter. Do they hate free speech in America?"

When he didn't get a response, Musk angrily asked, "What's going on here?," and tagged Cook's official Twitter account. But, Cook either ignored Elon or didn't see his tweet.

In any case, Musk continued his attack ... "Apple has also threatened to withhold Twitter from its App Store, but won’t tell us why."

Of course, Apple didn't respond ... but such a move would restrict some new users from downloading the Twitter app -- which Musk referred to as "censorship."

Elon finally moved on after taking a few more jabs at Apple, which also failed to elicit a reaction.

Apple is among several big corporations to have pulled ads from Twitter since Elon bought the company for $44 billion in late October. General Mills, Pfizer and Volkswagen have also paused their advertising to evaluate the changes to Twitter under Musk's new leadership.