Just closed $100 balanced account for no reason

About a month ago I registered for Bing Ads. I redeemed $100 within my account and my account was successfully balanced at $100. I started setting up my Bing Ads campaign and launched it about a week ago, I noticed it was not working as it should. Contacted Bing support and they said this will be resolved within 2-3 business days. 4 Days later and I receive an e-mail that my account has been closed for \security"reasons and they also state that they have the right not to mention why it was closed. <br> <br> I am beyond shocked. What in the world is this? How can a company just close your account if you still have $100 ( + - 1000.00 ZAR) credited account"