Company won't honor warranty - Uncle Mike's Super Belt Slide Holster

the hard plastic belt loop desegrated and they won't honor their LIFETIME warranty. When you call, they told me their lifetime warranty was for only a year. What the heck does that mean?? I have had the holster for about 15 years, but most of the sites that sell them, advertise it's a lifetime warranty, but they want a proof of purchase... Who keeps receipts that long. I'll buy a no-name, because their name means nothing.