I agree with Gustavo's answer and would simply like to add that, if the version with "and" is used, "and" should not be emphasized. "We don't have school on Sundays and Mondays" sounds like a riddle. It means that it is not the case that the referents of "we" have school on both of those days, leaving open both the possibility that they have school on Sunday (but not on Monday) and the possibility that they have school on Monday (but not on Sunday).
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