I accidentally bricked my Wii a few years back, fiddling around trying to install a mod chip (Wiikey I believe). I took it back the store and told them it broke itself, and they said they'd send it off for repair.
After a week, I called the store and pressured them about it, and said I was sad and wanted a replacement to play games on. They told me I could come and take a new unit, which they gave me.
About a week after that, some lady calls me from the repair centre calls and says they discovered I was messing around with a mod chip and that was not covered on the warranty. Since I already got a replacement, I was just like "Ok thanks, bye", and that was that.
My advice to OP: Just take it back to the store, tell them it broke itself. Have them send it off for repair. Wait a few days then preasure the store for a "temporary replacement", hopefully you'll get one.