Or HaChaim on Leviticus 26:21/אור החיים על ויקרא כ״ו:כ״א

1 ואם תלכו עמי קרי, "and if you walk contrary unto Me, etc." Inasmuch as the afflictions which have been visited upon the Jewish people are clearly the hand of G'd, their failure to react is described as walking contrary to G'd.

2שבע כחטאתיכם, "seven times more, according to your sins." Even though the Israelites had not become guilty of additional sins the fact that they had not become penitent is accounted as if the sins had been committed anew.