For only a single numbered $? I don't think they "stole" your weekly bonus.
I'm not very familiar with the detailed computation of stakes' VIP weekly bonus but I guess that the amount of bonus you get is determined by the percentage on the house edge of your bets.
Maybe you played this week on games that has low house edge so does it affected your bonus.
You can wait for more replies, maybe someone here as a better insights and explanation about that.