Hi Antoine,
I spoke with Zack at length and it appears that the domain registrar in this case Directnic screwed up with the auto renewal. The site Betreturns.com now loads ok. After looking at the code behind betreturns everything is tracked through betempire.com and not the returns URL so you lost no traffic, just that you were not able to see the stats for a couple of days.
Feel free to PM me at anytime.