I was working on a rx drug pricing system right out of college. I couldn’t always get my price calculations to match what a major insurance carrier came up with

I was working on a rx drug pricing system right out of college. I couldn’t always get my price calculations to match what a major insurance carrier came up with and the contract clearly stated the formula. Turned out the big carrier had a bug in their calculations that surfaced only under a specific set of circumstances. I felt very proud of myself for figuring out their big and did a detailed write up and submitted it to the carrier. Their response was “yeah we know, we’re not going to fix it though”. That floored me but I was right out of college and pretty naive hah.