Try having someone ask you interviewing questions so you’re more prepared. Also, practice leaving call back messages with others so you’re prepared for that too
Hey, you’re still in the running for the job aren’t you? You don’t say anywhere that he actually rejected you.
This may be fixable. Calling three times in two hours is not outrageously too much. And if you reach the manager just be a little more forceful and steady; if he likes you he may overlook that first phone call.