What is the reason someone would call you repeatedly with a blocked number?

Someone keeps blowing up my phone calling me repeatedly anywhere from midnight sometimes all the way till 4am just blowing me up on no caller id. I answer and I can hear background noise but they won’t say anything. I’m assuming it was a guy I was involved with but can’t really pin it on anyone.. lol I’ve already changed my number from this might have to do it again. What is the point of this? It’s extremely creepy

What is the reason someone would call you repeatedly with a blocked number?
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