所以我只好操起我两年来没用过的英语写了一封无论语法拼写或者其他各个方面都足以使任何一个英语老师都潸然泪下的错误报告发给blogger team ,时间是8月16日下午5点，等待回复中......
If you've written in, than you should get an answer shortly to help with your situation.
However, just to clarify what happens, if you change your settings toFTP publishing, Blogger will release your Blog*Spot address for other people to take. Assuming no one snagged it as soon as it was released,your subdomain should have been available for you to reclaim when you changed back to Blog*Spot. But, since you did all this in a very short time span, it is possible Blogger had not yet recognized that the subdomain was "abandoned."
This is a case that would be best handled individually by The Blogger Team, so I would suggest working with them if you still haven't been able to reclaim your subdomain.