Killer Instinct Big Game 2-7×36 Crossbow Scope Black

I mounted this couple weeks ago, I started noticing the illuminated site started to dim even though I had it off I just figured the battery was cheap one didn’t think anything about it well I just put in a Duracell 2032 battery and I’m getting nothing on the lights. I’m about to send it back and get another and try one more time but I’ve heard killer instincts customer service is hard to get a hold of. I literally got this on November 20 installed about week later now it’s December 12 but the light went out last weekends hunt. I do like the scope and the glass is clear but I definitely need the lighted part to work for low light.