50hrs seems way too early to need a belt if it hasn't gotten wet or been abused in some other way. How many miles?
We recommend the first service at 20hrs then every 50 after that so I wonder about your dealership. The machines come with the service interval set at 50 and we change them when the machine is delivered. If nothing else I would have them show you the old belt, compared with a new one and explain why it needs to be replaced. If they are good at customer service they should be willing to do this for you. Then if it does actually need to be replaced, maybe they can tell you what was happening that caused it so soon.
Mine: 2018 Sportsman 850SP - 26" Bear Claw HTRs on OEM steel wheels(I really don't like the Aluminum ones)
Polaris Hand warmers, Mirrors.
Hers: 2007 Sportsman 500 EFI, Polaris Winch, 26" Bear Claw HTRs on Moose 427x Wheels. QSC Clutch Kit, Hand Warmers
2001 Magnum 325 MOSE 12" rear wheel conversion. 25" Sedona Coyote tires
2001 Magnum 325 Warn winch and Moose 60" plow
2017 Polaris Ranger 1000XP - Roof and front glass
SOLD 2004 Sportsman 600 Twin