I played multiplayer and won so there is a free spin that will gave me a disignated challenge coins but when I use to spin again using my gems it doesn't count, the coins that I won in the spinner when I use my gems is useless because I didn't even get the prize, I lost a lot of gems without nothing exchange? Please do work for it.

Hey Ryan. Respinning the Roulette wheel doesn't actually pile up the rewards you get from multiple spins, all it does it let you try again for a different reward if you want. Sorry to hear you spent lots of gems on a misunderstanding, I recommend that you contact Customer Support to ask for the gems back

You can use this link to contact them:
https://socialpoint.helpshift.com/a/monster-legends-mobile/