I got the EXACT SAME THING!!!! And I heard back from Customer Support:
Hi Kenneth,
This is Lee from Bing Rewards Customer Support assisting you with Support Request 1299143390 regarding your Rewards account.
We've looked into the circumstances that resulted in our previous conclusion and please know that this is within our rights under the Program's Terms of Use. We made the decision after careful consideration. We regret informing you that your Bing Rewards account will remain closed.
Sincerely,
Lee
The Bing Rewards Team - http://bing.com/rewards
But they WILL NOT tell me what happened. I only use my Bing account at work, I am an IT Tech for a school department. And I only browse the headline squares that they have, I don't even use it for searching (maybe THAT'S why they cancelled it! Lol...)
In any event, I'm a little upset, but if that's how they want to be, without even explaining, then stick a fork in them....