First decapping die I ever bought was the Lee. Thousands and thousands of cases later it still does the deed. I've replaced a couple of pins over those years. Still going strong. I think you just lost patience with it, and that's fine.
I lost patience with a beeping smoke detector, changed batteries, few minutes later beeping. I checked the other rooms on the same floor. Definitely the same one. Replaced battery again. Few mins later, beeping. Took it off its mount, out to garage mashed it to bits.
Feeling satisfied, I again heard the beeping! Yup, it was the carbon monoxide detector in the same room!
With the Lee, only problems I've had were with crimped LC brass. I learned to tap it once, then go through if it budged. If it held tight, another tap and then through. Occasionally, the pin rises. Loosen, tap down, tighten with two wrenches.
Russellc