Olaf from Coinbase here.
I'm sorry about the cancellation. We use machine learning algorithms to determine risk, and their ability to differentiate a scammer from a legitimate user is getting better, but isn't perfect. Shoot me a PM with enough of your email address that I can find your account, or send a note to support[at]coinbase.com, and I'll review your account.
I also apologize for the delays in support responses in the last couple weeks - we are actively hiring additional support staff.