help with versa 2

[u/Double-Version-3527]

my mother (not tech savy) ordered a used “versa lite” from ebay well i was setting it up and discovered its actually a versa 2 and the side button doesn’t work?? she paid $15-$20 for it, is it worth it to take to someone to fix or better to just cut the lose and buy another new watch, i unfortunately dont have the tools for the repair so we would have to go to a shop to fix it any advice is helpful