His visa officer is taking revenge, because you caused extra trouble to him by sending him an unnecessary email.
There were many similar cases before. When sb. wrote to inquire about his process, his status was changed to background check in return, just overnight.
So remember don't complain, don't be hasty. We chinese are begging foreigners to be allowed to be admitted to be blessed to be treated like a man. We are not living in a good nation, the visa officer knows this well.
So don't cry.