Is it rude not to answer a call from my manager when im off the clock?

I work at mcdonalds. Twice this week I've been called to see if I can come in early because we are short staffed. I went in both times. My gm just called me 3 hrs before my shift, probably to ask if I could come in early, but I ignored it. Does that make me an asshole?

Is it rude not to answer a call from my manager when im off the clock?
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