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I think in most instances you don't get a 30 day late until you miss 2 payments. I know I had a few missed payments on my card when I was in college, but I never missed more than 1 and I have no 30 day lates. I think in nearly every case the most I missed it by was 1 week, and usually it was only a few days.
It does sound as if they are now 'chasing your balance'. So be prepared for another CLD when you make another payment. It's possible they will close the account when the balance is PIF'd