This error is incredibly insulting to a very large portion of the player base imo. Easily worse than anything I have ever seen in this game before, and that says a lot. What others spent time and comparatively large sums of money on over the course of years to build up and acquire, was given away at pennies on the dollar to a limited, but very significant portion of the player base. I am a big spender, more than I'd like to admit, but I will never, ever ever, drop a penny on this game again if this is not fixed. Other fairly big spenders I communicate with also have one foot out the door. Beyond insulting those who have spent a decent amount over the years, those who actually like war should probably care about this. They put unbeatable megabases behind a very big paywall and that at least restricted them some, get ready for plenty more in your wars coming soon.
But anyway, all of the complaints have already been stated, I really came here to offer what I thought was a possible solution. Here are two viable options imo:
1) Refund all of the $0.99 purchases. Remove all of the crowns that have not yet been spent. Even though its been days since the error, unless you're buying resources which is incredibly inefficient, not too much damage has already been done. Give affected accounts a 10k crown bonus compensation.
2) Refund all of the $0.99 purchases. Rollback only the affected accounts, remove all of the crowns. Give every affected account a 20k crown compensation. This will give them 10x more free speeds than the loss of one week's progress, probably more than that.
I hope its fixed. Unfortunately, I dont think BHG has either the skill or will to do anything about it, but wanted to at least put another possible idea out there, I think it is terrible for both players and Nexon if it is not corrected.