What does it mean when you blocked a guy's number and he keeps trying to call you back?

So, I met a guy from my school at the school's bus stop and we've been talking over winter break he sent me some interesting romantic messages and I asked him If it was okay that I didn't want to date him and he didn't respond in 17 minutes he called me an hour after I blocked him and he called me at noon today even though it's been 15 days that I've blocked him. So why is he doing this?

What does it mean when you blocked a guy's number and he keeps trying to call you back?
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