This is the response from Detroit office that I got today:
Dear Sir/Madam,
We do not respond to status enquiries regarding an application in process at our office while it is within the Normal Processing Time for your type of application.
Please note that due to a recently installed new computer system, processing times are longer than previously posted.
Applicants from countries to which the mandatory waiting period applies must first satisfy the waiting period BEFORE normal processing time takes effect.
If you wish to withdraw your application your request will be actionned within 10 working days irregardless if the request is made in person or via email. Please note that the processing fees are non-refundable and your documents will be returned to you by mail. You must complete the attached "Withdrawal Request". ((Link))
Regards,