Collection Agency Warning

I just got a letter from GE threatening to sic a collection agency on me if I don't make my minimum payment this month. This is crazy! GE is behind most of my cards, and the Dillard's card they are threatening me about has the smallest balance of them all. Besides I made a partial payment on it last month. How stupid is this? It is one of the ones I paid today, so it didn't cut short my stress free day.