The Agency Is After Me

I've been receiving letters from a collections agency. It's true that I ignored their initial letters requesting payment, all four of them, for months. But, on that last one I noticed the deadline was looming, so I sent the lab a check for my bill: $6.75. I haven't noticed if it's cleared yet since, well, it's a check for less than $7, but nothing has stemmed the tide of mail warning me that they're about to lawyer up and come after me. I'm not sure how much this company spends on collecting late bills, but I'd argue that they could profit from a cost/benefits analysis and perhaps focus their energies on people with delinquent bills that are over $7.